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Short exact sequence
I'm from a foreign country, I don't speak well English. Sorry.
Re: Short exact sequence
instead of $$.
The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment