While the single arrow in command
\xymatrix{A \ar[r] B}
is displayed by lyx, three arrow graph in command
\xymatrix{ & & p,a & \\ p \ar[r] \ar[ur] \ar[dr] & & p,n & \\ & & p,e & }
is undisplayed (yet correctly printed out)Any ideas? Any matrix or array specifications needed in the preamble? thank you ---P
