In \xymatrix, the command
\ar@{}[dr] |{\text{lab}}
typesets an empty arrow, broken by some text. Similarly, the command
\ar@/^10pt/ @{->}[ur] |{\text{lab}}
typesets a curving arrow, broken by some text. I would expect
\ar@/^10pt/ @{}[ur] |{\text{lab}}
then to typset a curving, empty arrow, broken by some text, but it doesn't. Is there a convenient way to achieve curving, empty, broken?

Here is a minimal example:

a \ar@/^10pt/ @{}[r] |{\text{lab}} & b  

1 Answer 1


I don't know why this happens, but replacing \ar@{} by \ar@{{ }{ }} or \ar@{ { }} works. But \ar@{{ } } does not :). A minimal working example:

\xymatrix{a \ar @{{ }{ }} @/^10pt/ [r] |{\text{lab}} & b}

If someone knows why this happens, edit me. My guess is that being more explicit to xy helps it.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .