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Newest Questions - Mathematics Stack Exchange
1 day ago · Mathematics Stack Exchange is a platform for asking and answering questions on mathematics at all levels.
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(Un-)Countable union of open sets - Mathematics Stack Exchange
Jun 4, 2012 · A remark: regardless of whether it is true that an infinite union or intersection of open sets is open, when you have a property that holds for every finite collection of sets (in this case, the union or...
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Mathematics Stack Exchange
Q&A for people studying math at any level and professionals in related fields
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Como calcular el area de la superficie de un huevo con calculo
Estoy haciendo mi reciente evaluación interna del IB Matemáticas HL y mi tema es cómo calcular el área de superficie de un huevo . Quiero aplicar el cálculo conocimiento en esta pregunta, pero mi conocimiento sobre es...
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functional analysis - Where can I find the paper "Un théorème de...
Nov 12, 2015 · J. P. Aubin, Un théorème de compacité, C.R. Acad. Sc. Paris, 256 (1963), pp. 5042–5044. It seems this paper is the origin of the "famous" Aubin–Lions lemma. This lemma is proved, for example, here and h...
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For what $n$ is $U_n$ cyclic? - Mathematics Stack Exchange
When can we say a multiplicative group of integers modulo $n$, i.e., $U_n$ is cyclic? $$U_n=\\{a \\in\\mathbb Z_n \\mid \\gcd(a,n)=1 \\}$$ I searched the internet but ...
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Intuitive proof that $U(n)$ isn't isomorphic to $SU(n) \\times...
Jan 5, 2016 · The "larger" was because there are multiple obvious copies of $U (n)$ in $SU (n) \times S^1$. I haven't been able to get anywhere with that intuition though, so it ...
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Mnemonic for Integration by Parts formula? - Mathematics Stack...
Nov 11, 2018 · The Integration by Parts formula may be stated as: $$\\int uv' = uv - \\int u'v.$$ I wonder if anyone has a clever mnemonic for the above formula. What I often do is to derive it from the Product R...
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Prove that the sequence (1+1/n)^n is convergent [duplicate]
Mar 27, 2019 · I know the proof using binomial expansion and then by monotone convergence theorem. But i want to collect some other proofs without using the binomial expansion. *if you could provide the answer w...
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Limit sequence (Un) and (Vn) - Mathematics Stack Exchange
Limit sequence (Un) and (Vn) Ask Question Asked 9 years, 3 months ago Modified 9 years, 3 months ago