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.

• 1 $\DeclareMathOperator{\Hom}{Hom}$ [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 \DeclareMathOperator with 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) $\a$.

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.

• 1 $\DeclareMathOperator{\Hom}{Hom}$ [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 \DeclareMathOperator with 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

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

• $\DeclareMathOperator{\Hom}{Hom}$ [link](http://mathoverflow.net) $\Hom (U\times V,W)$ and [another link](http://mathoverflow.net).
• $\DeclareMathOperator{\Hom}{Hom}$ [link](http://mathoverflow.net) $\Hom$ and [another link](http://mathoverflow.net).
• $\DeclareMathOperator{\R}{\mathbb R}$[link](http://mathoverflow.net) $\R$ and [another link](http://mathoverflow.net).
• $\DeclareMathOperator{\R}{\mathbb R}$ [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.

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.

• 1 $\DeclareMathOperator{\Hom}{Hom}$ [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 \DeclareMathOperator with 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) $\a$.