[Xy-pic] xy-pic arrow problem

Philip Hirschhorn psh at math.mit.edu
Sun Sep 18 20:47:10 CEST 2011

I can't explain the weird error message, but the problem seems to be
that you've left out the ampersand that should separate the nodes.

That is: your

  $\xymatrix{R\ar@{-->}[r] B}$

should be

  $\xymatrix{R\ar@{-->}[r] &B}$

In case it matters, I loaded xy-pic with


Phil Hirschhorn

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