In a comment of the form $\DeclareMathOperator\a{a}$Here's a [link](http://mathoverflow.net) and [another link](http://mathoverflow.net) $\a$, neither link is parsed; in a comment of the form $\DeclareMathOperator\a{a}$Here's a [link](http://mathoverflow.net)$\DeclareMathOperator\a{a}$ $\a$ and [another link](http://mathoverflow.net), the second link is parsed and the first is not; and in a comment of the form Here's a [link](http://mathoverflow.net)$\DeclareMathOperator\a{a}$ and [another link](http://mathoverflow.net) $\a$, both links are parsed.
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1 Answer
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This answer is intended for testing.
Please include the source code used in the comments into the answer — so that we can check when the link works and when it doesn't.
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$\DeclareMathOperator{\Hom}{Hom}$ [link](http://mathoverflow.net) $\Hom (U\times V,W)$ and [another link](http://mathoverflow.net). - 2
$\DeclareMathOperator{\Hom}{Hom}$ [link](http://mathoverflow.net) $\Hom$ and [another link](http://mathoverflow.net). - 3
$\DeclareMathOperator{\R}{\mathbb R}$[link](http://mathoverflow.net) $\R$ and [another link](http://mathoverflow.net). - 4
$\DeclareMathOperator{\R}{\mathbb R}$ [link](http://mathoverflow.net) $\R$ and [another link](http://mathoverflow.net).— The difference between this comment and the one before is just the space added before the first link. - 5
A $\DeclareMathOperator\a{a}$[link](http://mathoverflow.net) $\a$ and [another link](http://mathoverflow.net). - 6
A [link](http://mathoverflow.net) $\DeclareMathOperator\a{a}$and [another link](http://mathoverflow.net) $\a$.The problem seems to concern parsing of links between a\DeclareMathOperatorwith no following space and the invocation of that math operator, wherever they occur in the comment. - 7
$\DeclareMathOperator\a{a}$A [link](http://mathoverflow.net) and [another link](http://mathoverflow.net) $\a$. - 8
$\newcommand{\R}{\mathbb R}$[link](http://mathoverflow.net) $\R$ and [another link](http://mathoverflow.net) - this one uses "newcommand" rather than DeclareMathOperator - 9
$\def\R{\mathbb R}$[link](http://mathoverflow.net) $\R$ and [another link](http://mathoverflow.net) - this one uses "def" rather than DeclareMathOperator - 10
$\let\vp\varphi$[link](http://mathoverflow.net) $\vp$ and [another link](http://mathoverflow.net) - this one uses "let" rather than DeclareMathOperator
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$\begingroup$ $\DeclareMathOperator{\Hom}{Hom}$ link $\Hom (U\times V,W)$ and another link. $\endgroup$ Commented Dec 18, 2020 at 16:35
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$\begingroup$ $\DeclareMathOperator{\Hom}{Hom}$ link $\Hom$ and another link. $\endgroup$ Commented Dec 18, 2020 at 16:36
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$\begingroup$ $\DeclareMathOperator{\R}{\mathbb R}$[link](mathoverflow.net) $\R$ and another link. $\endgroup$ Commented Dec 18, 2020 at 16:37
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$\begingroup$ $\DeclareMathOperator{\R}{\mathbb R}$ link $\R$ and another link. $\endgroup$ Commented Dec 18, 2020 at 16:38
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$\begingroup$ A $\DeclareMathOperator\a{a}$[link](mathoverflow.net) $\a$ and another link. $\endgroup$– LSpiceCommented Dec 18, 2020 at 16:58
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$\begingroup$ A link $\DeclareMathOperator\a{a}$and [another link](mathoverflow.net) $\a$. $\endgroup$– LSpiceCommented Dec 18, 2020 at 16:59
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$\begingroup$ $\DeclareMathOperator\a{a}$A [link](mathoverflow.net) and [another link](mathoverflow.net) $\a$. $\endgroup$– LSpiceCommented Dec 18, 2020 at 17:00
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1$\begingroup$ $\newcommand{\R}{\mathbb R}$[link](mathoverflow.net) $\R$ and another link - this one uses "newcommand" rather than DeclareMathOperator $\endgroup$ Commented Dec 19, 2020 at 8:29
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1$\begingroup$ $\def\R{\mathbb R}$[link](mathoverflow.net) $\R$ and another link - this one uses "def" rather than DeclareMathOperator $\endgroup$ Commented Dec 19, 2020 at 8:29
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1$\begingroup$ $\let\vp\varphi$[link](mathoverflow.net) $\vp$ and another link - this one uses "let" rather than DeclareMathOperator $\endgroup$ Commented Dec 19, 2020 at 8:34
\DeclareMathOperatoris at the beginning, and only when\ais actually used, and that the affected span is between the declaration and the use. I updated the sample text accordingly. $\endgroup$$\DeclareMathOperator\a{a}$Here's a [link](http://mathoverflow.net) $\a$ and [another link](http://mathoverflow.net).$\endgroup$