\coloneqq

\coloneqq

[Jesse Alama]

I'd like to use a colon-equals sign symbol to indicate a definition.
According to The Comprehensive LaTeX Symbol List, this symbol is
available in the txfonts (LaTeX) package.  However, it seems that the
txfonts support in ConTeXt doesn't contain that symbol.  And, in any
case, a search for \coloneqq on the wiki gave no results.  Perhaps the
symbol I want isn't called coloneqq in ConTeXt, or perhaps the symbol is
currently missing.  How can I get this symbol in my ConTeXt document?

Thanks for your help,

Jesse

-- 
Jesse Alama (alama@stanford.edu)

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Re: \coloneqq

[Aditya Mahajan]

On Fri, 14 Sep 2007, Jesse Alama wrote:

> I'd like to use a colon-equals sign symbol to indicate a definition.
> According to The Comprehensive LaTeX Symbol List, this symbol is
> available in the txfonts (LaTeX) package.  However, it seems that the
> txfonts support in ConTeXt doesn't contain that symbol.  And, in any
> case, a search for \coloneqq on the wiki gave no results.  Perhaps the
> symbol I want isn't called coloneqq in ConTeXt, or perhaps the symbol is
> currently missing.  How can I get this symbol in my ConTeXt document?

The symbol is called \colonequals. Other colon symbols are (from 
math-ext.tex)

%D \macros
%D   {centercolon, colonminus, minuscolon, colonequals, equalscolon,
%D    colonapprox, approxcolon, colonsim, simcolon, coloncolon,
%D    coloncolonminus, minuscoloncolon, coloncolonequals,
%D    equalscoloncolon, coloncolonapprox, approxcoloncolon,
%D    colonsim, simcoloncolon}
%D
%D In $a := b$ the colon is not vertically centered with the equal
%D to. Also the distance between colon and equal to is a bit large.
%D So, we define a vertically centered colon \tex {centercolon} and
%D a few macros for colon and double colon relation symbols.
%D
%D \startlines
%D \formula {A \centercolon       B}
%D \formula {A \colonminus        B}
%D \formula {A \minuscolon        B}
%D \formula {A \colonequals       B}
%D \formula {A \equalscolon       B}
%D \formula {A \colonapprox       B}
%D \formula {A \approxcolon       B}
%D \formula {A \colonsim          B}
%D \formula {A \simcolon          B}
%D \formula {A \coloncolon        B}
%D \formula {A \coloncolonminus   B}
%D \formula {A \minuscoloncolon   B}
%D \formula {A \coloncolonequals  B}
%D \formula {A \equalscoloncolon  B}
%D \formula {A \coloncolonapprox  B}
%D \formula {A \approxcoloncolon  B}
%D \formula {A \colonsim          B}
%D \formula {A \simcoloncolon     B}
%D \stoplines

The naming is after colonequals.sty rather than mathtools.sty. I find 
these names easier to remember, but if you want mathtools type names, 
it is easy to create aliases by \let\coloneqq=\colonequals and so on.

Perhaps it is time to create a comprehensive math symbol list for 
ConTeXt also....

Aditya
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Re: \coloneqq

[Taco Hoekwater]

Jesse Alama wrote:
> I'd like to use a colon-equals sign symbol to indicate a definition.
> According to The Comprehensive LaTeX Symbol List, this symbol is
> available in the txfonts (LaTeX) package.  However, it seems that the
> txfonts support in ConTeXt doesn't contain that symbol.  And, in any
> case, a search for \coloneqq on the wiki gave no results.  Perhaps the
> symbol I want isn't called coloneqq in ConTeXt, or perhaps the symbol is
> currently missing.  How can I get this symbol in my ConTeXt document?

ConTeXt has \colonequals  and \coloncolonequals. I assume one of
those is the one you want.

Best wishes,
Taco


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