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# /sci/ - Science & Math

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 >> Anonymous Thu Nov 9 04:13:07 2017 No.9284936 [View] File: 382 KB, 640x480, Asuka_smiling.png [View same] [iqdb] [saucenao] [google] [report] What is the exact meaning of quotient spaces? i mean i know the definition, but what is the essence of it? take $\mathbb{R} / \mathbb{Z}$ for example.
 >> Anonymous Sat Oct 21 06:27:36 2017 No.9246933 [View] File: 382 KB, 640x480, Asuka_smiling.png [View same] [iqdb] [saucenao] [google] [report] What book do you recommend as a gift for a friend who is a freshman mathfag?
 >> Anonymous Fri Sep 22 05:45:50 2017 No.9184275 [View] File: 382 KB, 640x480, Asuka_smiling.png [View same] [iqdb] [saucenao] [google] [report] Hi /sci/, physicsfag here. Is it worth it to get a second degree in mathematics or should i just proceed to a masters degree on mathematical physics (i.e. QFT)? I mean i really like them and been studying math all the time. Not baby math too, currently studying deRham cohomology and Lie theory.
 >> any thoughts? this seems easy but i want a 100% proof  Anonymous Mon Sep 18 17:34:32 2017 No.9177334 [View] File: 382 KB, 640x480, Asuka_smiling.png [View same] [iqdb] [saucenao] [google] [report] Let A be a non empty subset of $\mathbb{R}$. Suppose that there exists a sequence of real numbers $x_n$ such that: i) every term of $x_n$ is an upper bound of Aii) $x_n \rightarrow a$ for some $a \in A$. prove that $a=max\{A \}$.

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