[OS X TeX] diagonal arrows in figures

[Gerard Walschap]

	I have a question that may very well have been answered in some past 
post; if so, my apologies. How does one put diagonal arrows in 
commutative diagrams? My solution, which is quite cumbersome, has been 
to use the "picture" environment, and construct everything by hand. 
Surely, there must be a package that addresses this. If so, here's 
another question. Assuming it's not on Gerben's distribution, where 
should it go after downloading?

	Many thanks,

	-gerard

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