/sci/ - Science & Math

>>9671618
Who is she? It depends on the level you wish to get. Assuming you refer to plebs linear algebra and that you had no exposure so far, I say it then it will take longer than that. You will need time to do exercises, and you can read all the theory in two weeks but you probably won't have a good knowledge (here I'm projecting the old me on you). Still it is a start.

>>9671882
What at are you referring to? To me it looks quite fine, you can think of stuff in a non-rigorous way (that's what you call an idea), and if it is correct then you can prove it.

>>9646036
If we talk logic here, I'd definitely consider the zero in two non-isomorphic groups as different object, even if one embeds in the other.
If they are isomorphic, but you still speak about models in set theory, then they will generally also not be equal. In that case you can at least as the question, even if it's evil (TM).

Probably worth mentioning that R and R^3, both considered as R-vector spaces, don't permit an isomorphism in any case, afaik.