Switch to a TeX engine and a font family that can handle the character U+2010 directly. 2-em dash 用来表示单词拼写不全，或名字的省略，或粗话的省略，或无法识别的字迹等。. show (), you can display the same figure in a Dash application by passing it to the figure argument of the Graph component from the built-in dash_core_components package like this: Detailed examples of LaTeX including changing color, size, log axes, and more in Python. If you’re operating on a Mac, the basic instructions for MS Word and Google Docs above should still apply — though you’ll have different keyboard shortcuts. documentclass{article} % Preamble egin{document} % Body end{document}So don't worry, fans of LaTeX em-dash :) --- In contrast to the above, which will ensure that this is on a nested slide. I am trying to get an en-dash by using two '-' characters, but instead of appearing as one long en-dash symbol, I'm getting --. TeX. Compatibility issue: Most existing markdown implementations don’t do these substitutions (at least by default), so if CommonMark would require such. To print this symbol next to the letter you need to use the sim command and use this command in Math mode of latex. I process the markdown file with the -S option with. These listings and proofs are rather math-heavy, and thus are not wrapped in verbatim or lstlistings. In doing so, the em dash acts similarly to commas, semicolons, colons, and parentheses. For example, Chicago Style dictates that you must not have spaces before and after the em dash, while AP Style dictates that you should have spaces before and after, except when used to introduce items in a vertical list. In LaTeX, ---is an em dash. Dashes are used to set off part of a sentence. Video advice: Initial D – Deja Vu. 2. Skip to content. And you can use this command in either math mode or text mode. Lengths can be changed by the command: \setlength{\lengthname} { value _ in _ specified _ unit } For example, in a two-column document the column separation can be set to 1 inch by: \setlength{\columnsep} { 1in } Below is a table with some of the most common lengths and their. How to type Hyphen, En-dash, and Em-dash in LaTeX? Our main objective is to teach you LaTeX in a very easy way. LaTeX knows four kinds of dashes: a hyphen (-), en dash (–), em dash (—), or a minus sign (−). Horizontal bar character, Unicode U+2015. You can access three of them with different numbers of. The em dash can be used to introduce dialogue — Like this? — Yes, like this. (Pedantic note: this happens only if the \hyphenchar parameter for the current font is the hyphen. Were Rear-ended The Three Dashes And When To Use Them. ) 03/27/03. The cursor in the REPLACE mode is the character that is telling us: "I will be replaced with a provided character". hyphen，-用于复合词 upper-case letter Tip 2: Dashes in LaTeX. According to grammarbook. dash. documentclass[12pt]{article} usepackage[paperwidth=95mm,paperheight=55mm,margin=5mm,right=24mm,marginparsep=5mm]{geometry}. However this switch mechanism works only for latex. Sorry. Dashes are often used informally instead of commas, colons and brackets. You can do several things. Postby victorclaessen » Wed Jan 19, 2011 8:41 pm. In this chapter we will tackle matters related to input encoding, typesetting diacritics and special characters. (If you do, up vote that answer. Logout. ch . Use the WORD JOINER Unicode character ⁠ on either side of your hyphen, or em dash, or any character. x ] [ lambda (x-a) ] [ lambdaleft (frac {1} {x} ight. No. Notice especially line 5: "s—-" where the "s" is lopped off and the em-dash is followed by a hyphen. - is really horrible and the dashed line cannot even be represented this way (-- is the en-dash). Alternatively, you can modify the labels of only certain levels with. Output : You need to use imath and jmath instead of unit vectors i and j. Here I define a \longdash command, by default it's (slightly less) than an em-dash; it has an optional argument: \longdash[4] is (slightly less than) four en-dashes. The rho symbol is a popular symbol in physics that represents density. Dot notation for derivative of a vector in LaTeX. 5ex]{2em}{0. Using em dashes instead of parentheses puts the focus on the information between the em dashes. lstinline { [RegularExpression (@"d+")]} Since all characters will be displayed as they are, it is not possible to execute any command inside the block. A dash is longer than a hyphen and is commonly used to indicate a range or a pause. Learn how to use em dashes in a sentence with these examples and best practices. A hyphen (-) is the shortest “dash” and connects two words. Type two hyphens with no space between them like–this. Chapter 1: Writing documents Section 1. 9. It can also be used for clarity in forming complex compound adjectives. Any suggestions on how to. We love good questions. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. em dash. Here is a MWE: \\documentcl. , and of the Regency. " For instance the style guide I'm following suggests using en dash to reduce the ambiguity in post-apocalyptic-–science fiction movies. A “Em Dash” can be used when you are in a. You can then use new dashes to control breaking behaviour of words with dashes. S—— entered into. Minus signs To get a minus sign, which is longer than a hyphen, you need to go. Logout. You. UserGuide 3. Equivalently for the others. documentclass{article} % Preamble egin{document} % Body end{document}Sorted by: 6. en dash: –. Latex will automatically turn it into an en-dash. 8. If you're in a program that includes a formatting toolbar, like Microsoft Word, you can use the symbols or special characters section of your word processor and search for the em dash there. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. documentclass{article} % Preamble egin{document} % Body end{document}A placeholder is something used to denote or reserve a place for something to come later. Against all odds, Pete—the unluckiest man alive—won the lottery. There are also other packages that allow you to print intersection symbols in documents. Skip to content. How to type Hyphen, En-dash, and Em-dash in LaTeX? Our main objective is to teach you LaTeX in a very easy way. And if you don’t enclose the characters in curly brackets then the first character will be valid as a. documentclass{article} % Preamble egin{document} % Body end{document}Info Newest Frequent Score Active Unanswered. I am typesetting a book in Russian language and I noticed that, in some cases, an overfull box appears which cannot be solved via manual hyphenation or linebreak or even emergencystretch, because an em-dash is causing it. documentclass{article} % Preamble egin{document} % Body end{document}Here is a variant on Herbert's answer, using dimexpr instead (inspired from the thread ifnum for real numbers of comp. 0, output defaults to em-dashes, but setting longdash to false reverts back to hyphens: usepackage[style=mla,longdash=false]{biblatex} So you may want to tryNo. In the case of LaTeX, cap and igcap commands are used to represent this symbol. If you or your company would like to sponsor improvements to LaTeX rendering in Dash, get in touch with our advanced development team. How to type Hyphen, En-dash, and Em-dash in LaTeX? Our main objective is to teach you LaTeX in a very easy way. 04/02/03. 3. The en dash is the width of an uppercase N — half the size of the em dash. The OT1 table doesn't contain the pipe symbol, but it can be found in the T1 table. For more on leaders, see Want to fill line with repeating string. In the following example, LuaLaTeX and the EB Garamond font are used. I have the opposite problem. These can be inserted using -, -- and ---. , a literal em-dash, U+2014, in the source: DeclareUnicodeCharacter{2014}{dash} dash can then be defined in the usual manner; I use: DeclareRobustCommanddash{%. In the following example, LuaLaTeX and the EB Garamond font are used. tfm > cmlh10. 54. e. For unordered lists, LaTeX provides the itemize environment and for ordered lists there is the enumerate environment. The trouble is the em-dash, which I can’t set in the listings environment. So, the following will assign the class “green. To typeset an em-dash in Latex, use triple hyphens: ‘---’: A comment---like this---uses an em-dash, not a hyphen. The ar and overline commands. It should be noted that dashes are almost never required by the rules of grammar and punctuation. For example, if a 'b' comes before the dash or a '6' comes after,. How to type Hyphen, En-dash, and Em-dash in LaTeX? Our main objective is to teach you LaTeX in a very easy way. The underscore character is usually used to write a subscript in Math mode in latex, so it is not possible to print this character directly in the document. Solution for older releases. The styles of biblatex-chicago do not know that option and do not allow you to turn the dash off easily. Of course, you could write your own macro with own kerning etc. Christine Cloud, Producer. imath and. ]. Depending on the context, the em dash can take the. Certainly a sentence with more than two is imparsible. Dashes and Hyphens. I'd love it if docutils would actually interpret "--" and "---" as LaTeX does, but I'm sure that would be a philosophical hurdle. A hyphen is not a dash—it is a character for specific purposes. g. 等价于中文破折号（Many influencing factors—temperature, reaction time, type of catalyst—were screened） 例外：其他英语语法有规定的解释性同位语不使用Em dash，如非限定性定语从句。 使用 En dash（中号横线）的情况 This will insert the em dash symbol into your Word document. MatLab command. The em dash is the most beautiful punctuation mark, all the more because it is rare --- and it is best kept that way. doncherry. Mind that the <pre> bits will show up as-is if you use Zotero for non-BibTeX (ie Word) citations. documentclass{article} % Preamble egin{document} % Body end{document}The em dash has several uses. UserGuide 3. Find out how to type em dashes, when to use them, and see the difference between an em dash vs. 4 Spaces around em-dash By default, the half-space is inserted before and after em-dash. All the predefined mathematical symbols from the TeX package are listed below. For a horizontal dashed line add the command hdashline in ERT as first element of the first cell in the table row. Double integral → ∬. --old-dashes Selects the pandoc <= 1. In Latin modern the hyphen is visibly thicker and lower than en-dash and em-dash. So you need to use the extunderscore command to print this or you can use \_ this too. MAC: option + shift + hyphen (-) 3. Type two hyphens with no space between them like–this. x \] \ [ \lambda (x-a) \] \ [ \lambda\left (\frac {1} {x}\right. text. If you want to use the ligatures --and ---with standard unicode fonts, use: 1 Answer. The en dash derives its name from the fact that it is meant to be the same width as the letter N. Words hyphened with these dashes can also be broken at other positions than the dash -/ hyphen -- en-dash --- em-dash; extdash. Here I define a longdash command, by default it's (slightly less) than an em-dash; it has an optional argument: longdash[4] is (slightly less than). — –. ﹘, “Two-thirds” em-dash, between en-dash and em-dash. The trouble is the em-dash, which I can’t set in the listings environment. I want to write three short dashes ---, but Latex automaticaly change it to one long dash (em-dash). As a "phrase marker" – a kind of alternative to the parentheses – the en dash should have space either side. According to the docs, Xaringan should. Improve this question. In fact, more than a few in a whole article is probably getting annoying. The problem. Another way to put it: Dashes are OK in situations where parentheses would also be acceptable, as in my second example, and probably also in your original example. Hyphens are used in compound nouns such as right-quote. Corrected LaTeX em-dashes (from 4 to 3). [4] 3. 14. Stefan Kottwitz Site Admin Posts: 10061 Joined: Mon Mar 10, 2008 7:44 pm. \lambda → λ. When typing, use two hyphens together without spaces to form a dash. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. 7. To modify the book function, search for the following lines of code: Em dashes are used to replace commas, parentheses, colons, and semicolons. The en dash is the width of an uppercase N — half the size of the em dash. lambda. Select the "More Symbols" option to get the full list of special characters. it's in unicode at U+2259, so it's in the stix and xits fonts, perhaps with the name wedgeq. Observe that this is a LaTeX issue, not a BibTeX issue. There are four kinds of 'dashes' in LaTeX: hyphen, en-dash (--), em-dash (---) and minus $-$. Use 2 em dashes for some quoted speech and deliberate omissions in text. I know I can create an em-dash with ---(and an en-dash with --). The Spanish names for the hyphen, en-dash and em-dash are guión, semiraya o raya menor, and raya, respectively. org. To get an em-dash, you can either add an ERT and type ---, or go to Insert --> Special character --> Symbols, and find the em dash under General punctuation. This is strictly a BBT thing and Zotero doesn't know about it so will treat it as if you. \documentclass {article} \begin {document} \ [ 1 = \lambda f. You don’t need to use any package for. The em-dash (—) The em-dash is normally twice as long as the n-dash; its length is equal to the width of the letter m, whence the name. tfm` . Typing “---” prints just three hyphens, \emdash{} doesn’t print anything at all, escaping the listings environment does print the em-dash, but it creates trouble with the string formatting: The space characters are. How to type Hyphen, En-dash, and Em-dash in LaTeX? Our main objective is to teach you LaTeX in a very easy way. En-dashes are used to express a range (“5–10 year sentence”). 7. With respect to dashes, good math books have, at least, four kind of different symbols: a hyphen (-), an en-dash (–), an em-dash (—) and a minus sign (−). However when I type extendash, I *do* get an en-dash. No installation, real-time collaboration, version control, hundreds of LaTeX templates, and more. You can do several things. The em dash is made on most PCs by holding down the ALT key while typing 0151 on the keypad ( — ). 11–25. For Example: Weeding, planting, and watering — that’s all we did this weekend to clean up the garden. $. See how it works on Vimeo . Even though LaTeX is relatively easy to use, sometimes building complex typographical structures such as tables can become challenging. True, but having an overlong. テクノロジー. The ‘obvious’ way to do this is probably to write A\,---\,B rather than A---B (no spaces) or A --- B (unfortunately large spaces). How to type Hyphen, En-dash, and Em-dash in LaTeX? Read More »An unspaced em dash won’t automatically break over a line. frenchsetup {ItemLabeli= extbullet, ItemLabelii= { ormalfontfseries extendash}} Accepted keys are ItemLabeli up to ItemLabeliv. 10: Dimensions, hyphenation, justification, and breaking. On the keyboard. There are many different types of integrals and the LaTeX amsmath package provides us with the various commands to typeset them as shown in the table below : LaTeX command. This gives the usual en-dash. Use the em dash to denote a break in a sentence: ‘He was running, Watson—running desperately’. Thus, an em dash in 9-point type is as long as the height of a. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. 6. 7. The largest dash is the "punctuation dash", and you use three consecutive dashes to create it, something like this: "He came in the room ---. Perhaps the dashes don't need to be in CSL & Zotero could always use an en dash. There are three types of dashes you can create with LaTeX: A dash between words, like "near-perfect". Short and simple. The em dash can function like a comma, a colon, or parenthesis. dash. For example, Mr. Any idea how to override that so I can get my three figure dashes instead? Top. You don’t need to use any package for. The main use of em dashes is to set off extra information in a sentence. An em-dash (or an en‐dash with spaces) is used to indicate a parenthetical clause/phrase (which, if removed does not interrupt the sentence), this is written in TeX by three consecutive hyphens, ---or extemdash. – En dash: a mid-sized dash (longer than a hyphen but shorter than an em dash), shows a link or relationship between two concepts, or a range. This let us set a sentence like so with subtle perfection. Inserting an em-dash in Latex; Spaces and dashes; How to use an Em Dash (—) Properly. dashleftarrow → ⇠. In every page title on tex. I chose the filename cmlh10 where lh stands for “long hyphen”. The trouble is the em-dash, which I can’t set in the listings environment. There is a difference between -- and \-- as well as --- and \---. 2. h1 = text(2,6,['Test' char(8212) 'example']); Please refer to the following page to see numeric codes for the common dashes:. Is it better to omit the spaces between the words and the dash, or is it preferable to separate them with spaces instead? For example: No. Hello all. You can access three of them with different numbers of consecutive dashes. I am using the natbib package with a bibliography style close to humannat, (I have changed it in only one place), and I would like to get a long dash instead of the full author name in multiple references where the author is the same. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. LaTeX distinguishes three different types of dashes in text: the hyphen -, the en dash - and the em dash —. a^ {primeprime} → a”. I was wondering if there is a way to make the hyphen and en dash in a compound word appear at the same "height. The em-dash—which is longer than en-dash—is used for punctuation in sentences and in-line comments. The em dash (—) is the long dash—it’s roughly the same length as a capital M. I've noticed that en dashes and em dashes run into certain numbers and letters, and I don't believe it's standard to use spaces with these. The em dash is a great way to make a sentence more interesting while adding clarity to topics that may otherwise be confusing; it also helps make the writing stand out from the rest. It isn't nice to have em-dash at the end of a line too. I'm a technical editor at Microsoft and, for over a decade now, I use the HTML code because it's easy to remember! More important is to know when to use an em dash or an en dash. LogoutThere is also an "en dash"—whose length is between that of the hyphen and the em dash, and its best usage is to indicate inclusive dates and numbers: July 6–September 17 pp. org. dash instead of author name in repeated refs Topic is solved. Follow edited Jul 26, 2011 at 18:32. From a graphic design perspective, I think it looks better, just in case different dashes occur on the same line. documentclass {article} usepackage {MnSymbol} egin {document} [ ABC dashleftarrow 123 ] [ XYZ dashleftarrow 123 ]. They are. En-dashes are used for intervals of numbers such as 4–6. Switch to a TeX engine and a font family that can handle the character U+2010 directly. Symbol/Unicode. Typing “---” prints just three hyphens, emdash{} doesn’t print anything at all, escaping the listings environment does print the em-dash, but it creates trouble with the string formatting: The space characters are. 使用 Em dash（大号横线）的情况. This depends on the font, If I use SimSun (as I had used it in a previous answer) I see no gap if I use the input you show (2 em dashes) I do see a gap if I use the classic TeX input -----Unicode 6. 1. LuaLaTeX is not inserting em dashes unless there is space around the triple dash. tfm` . You can use opt-hyphen and opt-shift-hyphen to create an em- or en-dash whenever you want. You should never insert a hyphen manually to break a word; all modern word processors include an English dictionary and are able to. You could use tikz/pgf for this short in-text drawings (and even for the figures themselves, of course), although it could be considered overkill. documentclass {article} egin {document} [. It can either end or begin a line of text. vpl. (As in: "A specter is haunting Europe—the specter of Communism. The en dash is a symbol (–) that is slightly wider than a hyphen (-). While it looks fine in. But I think it's okay, because the text was very high quality. Below are some uses of theta symbol in latex. Place a manual hyphenation in the word preceding the em-dash - sometimes Latex will break it there. Quadruple integral → ⨌. You will find this material in chapters 8–12. You can define it as follows. 如果整个单词都丢失了，2-em dash 的左右两侧都应留出空格，如果只有一部分丢失，那么在 2-em dash. On a PC with a number pad, you can type the minus key while holding down the control and. Of course, if you are going to use this a lot, you can define a new command to simplify the writing. documentclass {article} egin {document} [ abla f = grad : extit {f. g. How can one obtain ----typeset as one long separator of the size of 4 hyphens joined? PS: A mechanism for possible extensions (with an argument) to longer widths would be a bonus, e. between these two lines of code. Logout. Manuel Kühner asked why the position is important for me. 1): Even in English writing, many style guides recommend to use an en-dash surrounded by spaces in places where the (American) writer would commonly use an em-dash: [. . MWE: documentclass{article} usepackage{fontspec} setmainfont{Linux. The main use of em dashes is to set off extra information in a sentence. Some word-processing programs have a mark called an em-dash (longer than a hyphen), which can be used with no space before or after it. Latexhelp. Dashes in Latex Subject: Re: dashes Date: Tue, 29 May. 3. I think the OP's objective is to find a way to permit LaTeX to hyphenate words that precede or follow an em-dash. . Putting spaces before and after an em dash is a matter of preference; just. How to type Hyphen, En-dash, and Em-dash in LaTeX? Our main objective is to teach you LaTeX in a very easy way. In most. Catherine Traffis. The em dash in American English is a punctuation mark that helps to convey emphasis, introduction, interruption, or a swift change of thought. Another beautiful dash defined as a symbol. They also, of course, are used when words are broken across two lines. @Karl: Wrt. The example document. Consider the following code which defines an em dash: documentclass{book} usepackage[T1]{fontenc} usepackage[sfdefault]{cabin} ewcommand{emdash}{ obreak--- obreakhskip0pt} egin{document}. Why is this happening?1. 14. Colons are to be used if the real information is after the item, as in the song challenge example. However, some style guides, such as the Associated Press. Skip to content. Em-dashes mark a pause, setting one part of a sentence off from the other, as in a parenthetical or. Late to the party, but I think this is actually the most elegant. name. In the following document, we will refer to special characters for all symbols other than the lowercase letters a–z, uppercase letters A-Z, figures 0–9, and English punctuation marks. Otherwise, look for an “insert symbol” command. With mathpazo all characters are roughly at the same height, but the hyphen is still a tad thicker. 2. a dated 29 August 2015). In a Microsoft Word document, choose Insert in the Menu bar. enダッシュが半角、emダッシュが全角とされることがある。 なお、Unicodeの全半角に当たる東アジアの文字幅 (East Asian Width) では、enダッシュはNa（半角）、emダッシュはA（場合による）である。 和文組版. Type this sign on Mac, press and hold the Command (⌘) key and the hit the M key. \iint. Quadruple integral → ⨌. But when you want to use more than one character as a superscript then you have to enclose the characters in curly brackets {}. documentclass{article} % Preamble egin{document} % Body end{document}How to type Hyphen, En-dash, and Em-dash in LaTeX? Our main objective is to teach you LaTeX in a very easy way. For example, if a 'b' comes before the dash or a '6' comes after, the dash looks like it's actually touching the character unless you zoom way in. 1 Answer Sorted by: 21 You can use microtype: documentclass {article} usepackage [kerning=true] {microtype} SetExtraKerning {encoding = {OT1,T1,T2A,LY1,OT4,QX,T5,TS1,EU1,EU2}} % all text { extemdash =. There is one problem that currently seems insolvable to me. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. What is L AquickguidetoLATEX ATEX? LATEX(usuallypronounced“LAYteck,” sometimes“LAHteck,” and never “LAY tex”) is a format, or collection of macro commands, for TEX, the standard for most professional mathematics and scientificLearning Em Dash Use Strategies and Best Practices. Hair space with em dash left — right No space with em dash left—right Computing applications Programming languages. Insert an em dash in Scrivener for Mac with a shortcut. Standard LaTeX dashes- Standard LaTeX hyphen-- Standard LaTeX en-dash--- Standard LaTeX em-dash; extdash breakable dashes. LogoutThe em-dash—which is longer than en-dash—is used for punctuation in sentences and in-line comments. Use siunitx package for degree celsius symbol. documentclass {article} egin {document} [ vec {p} ] end {document} Output :An em-dash is typically used as a stand-in for a comma or parenthesis to separate out phrases—or even just a word—in a sentence for various reasons (e. You have, at least, three possible options: Use \textemdash instead of ---. The easiest way to print a prime symbol in a latex document is to use a prime ( ') symbol or prime command. It's position is 7C. It is similar in appearance to the hyphen but is longer and sometimes higher from the baseline. densely dashed and loosely dotted. Triple integral → ∭. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. ”. Creating an em dash can be done by either: [ctrl] [alt] and the minus sign on the numbers pad or [alt] 0151 (on the numpad) 2 em dash. vpl. It is accompanied by practical implementation of code and output, so that the depth of knowledge increases. y' y′ のような微分の「プライム記号」の解説ではありません。. Use one before the parenthetical information and one after it. You're set! Now you can quickly make an em or en dash in any app. It's only a small difference but I was curious if there is a proper way to handle this. The Em Dash is used (among other cases) to separate phrases. (They’re called. The 2010–2011 season was our best yet. In the symbols menu, scroll down an select the em dash. No installation, real-time collaboration, version control, hundreds of LaTeX. TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. All over the internet, there's this question on how to make LaTeX do the en-dash and em-dash. (To be honest, I proofed the first 250 pages in detail, and then just checked the remainder for formatting. It accepts a callback function. Like a colon, an em dash introduces a clause that explains or expands upon something that precedes it. Insert the hyphens using BBTs "raw inserts", which would look like 081401<pre>hyphen</pre> 1--081401<pre>hyphen</pre>4. idx file, which is then sent through the makeindex program to create an . cp `kpsewhich cmr10. This will produce a thick short dash before the h, but a longer thinner dash (em dash) before help. LaTeX symbols have either names (denoted by backslash) or special characters. sentence-per-line, no em-dash spaces: The food---which was delicious---reminded me of home. . Download the latest version here . The babel package for Cyrillic defines the command "= which should be used instead of dash: so you can write по"=своєму and it will correctly hyphenate that word. The usual technique of typing "--" for en-dash and "---" for em-dash does not work. The long dash is the widest of the three horizontal marks that may be used in the middle of a sentence. Just my opinion, but it would seem to me a bit ugly to have a hyphen in a word that also adjoins an em-dash. Type of symbol. In order to have an em-dash displayed within a figure, the "Interpreter" property of the text should to be set to "LaTeX" and the equivalent LaTeX command "---" should be typed. Below are some examples of the use. clause-per-line, inconsistent em-dash spaces: The food ---which was delicious. To write the Left Dashed Arrow symbol in a latex document, you need to use the dashleftarrow command of the MnSymbol package.