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- How can I make this diagram a bit nicer? And is there any way to do a triangular diagram?

I know that TikZ is probably the best way to do this but most Forums don't use it. I can make a rectangular diagram, but it's a bit clunky:

Say I have the commutative function diagram:

##\begin{array}{ccccc} ~ & ~ & f & ~ & ~ \\ ~ & A & \longrightarrow & B & ~ \\ g & \downarrow & ~ & \downarrow & h \\ ~ & C & \longrightarrow & D & ~ \\ ~ & ~ & k & ~ & ~ \end{array}##

It isn't bad but is there a way to do this without using an array? And is there any way to do a triangular diagram? ie. A to B, A to C, and B to C?

Thanks!

-Dan

Say I have the commutative function diagram:

##\begin{array}{ccccc} ~ & ~ & f & ~ & ~ \\ ~ & A & \longrightarrow & B & ~ \\ g & \downarrow & ~ & \downarrow & h \\ ~ & C & \longrightarrow & D & ~ \\ ~ & ~ & k & ~ & ~ \end{array}##

It isn't bad but is there a way to do this without using an array? And is there any way to do a triangular diagram? ie. A to B, A to C, and B to C?

Thanks!

-Dan