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I'm presently taking a Linear Algebra I course (in French). I'm having difficulty learning how to do demonstrations using axioms/propositions.

For example, if I had to prove somcething like -(-B) = B or something like (B^-1)^-1=B, it just seems so obvious to me that its correct. I don't want the answer, I just want to learn how to basically prove simple problems like those so I can move on to harder ones.

I think the main thing I don't get is where do I start or what is the first thing I should do when I have demonstrations to do? (yes, I've looked at the list of axioms and such..)

Any insight would help!

Thanks,

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# Demonstration/proof advice needed

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