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[Frank <address@hidden>]

Hello all,

I tried the following code to generate a commutative diagram:

<tabular*|<tformat|<table|<row|<cell|X>|<cell|<long-arrow|\<rubber-rightarrow\>||f>>|<cell|Y>>|<row|<cell|\<longdownarrow\>>|<cell|>|<cell|\<longdownarrow\>>>|<row|<cell|U>|<cell|<long-arrow|\<rubber-rightarrow\>|\<alpha\>\<circ\>\<beta\>\<circ\>\<gamma\>\<circ\>\<delta\>\<circ\>\<epsilon\>\<circ\>\<phi\>\<circ\>\<gamma\>\<circ\>\<varphi\>\<circ\>\<varpi\>>>|<cell|V>>>>>

I find that the top horizontal extensible arrow is too short. I can add 
\qquad to the subscript of it to adjust the length, but it is very 
cumbersome. Is there any trick to render the arrows in the diagram so 
that the length of arrows in the diagram are automatically determined, 
just like the behavior of CD environment in amscd in LaTeX?

Thanks!

--
Best wishes!
Yours,