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  1. (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 …

  2. Newest Questions - Mathematics Stack Exchange

    1 day ago · Mathematics Stack Exchange is a platform for asking and answering questions on mathematics at all levels.

  3. Mathematics Stack Exchange

    Q&A for people studying math at any level and professionals in related fields

  4. 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

  5. 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 …

  6. probability - If $U\sim U (-1,1)$ and $N\sim N (0,1)$ are independent ...

    Apr 15, 2023 · If $U$ and $N$ are independent r.v.'s (with finite moments of order $4$) then $U$ and $UN$ CANNOT be independent unless $U$ is a constant.

  7. 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 did ...

  8. 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 …

  9. How to find generators in $U(n)$? - Mathematics Stack Exchange

    Nov 12, 2017 · $U (n)$ is poor notation for this group since it more typically refers to the unitary lie group. As for the question: en.wikipedia.org/wiki/…

  10. Limit sequence (Un) and (Vn) - Mathematics Stack Exchange

    Limit sequence (Un) and (Vn) Ask Question Asked 9 years, 4 months ago Modified 9 years, 4 months ago