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Hi guys...

I would like to create a theorem enviroment, but I would like it to end with the QED character (some few authors seem to prefer this option because Definitions, for instance, have nothing to mark their end). What I have been doing now is to do something like

\begin{mydefinition ...

In fact I know how to put more than one optional argument. This was not my question, but thank you for your attention.

Hi everybody (I'm new here ^ ^)

So, I'm working with latex for years. I have my own .sty file, and I am trying to make it "clean" and easier to use - even for myself.

One thing that annoys me is when I have to write a subset, for instance

$$\mathbb C^{x\times y\times z}$$

Recently I found out ...