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  2. 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 …

  3. Mathematics Stack Exchange

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

  4. $\\operatorname{Aut}(\\mathbb Z_n)$ is isomorphic to $U_n$.

    Aug 3, 2023 · It might be using ring theory in a non-essential way, but it is conceptually simpler because the endomorphisms are easier to describe than the automorphisms, and since the …

  5. Calculate the cohomology group of $U(n)$ by spectral sequence.

    May 31, 2015 · We have Ep,q2 ≅ Λ[c1,c3] E 2 p, q ≅ Λ [c 1, c 3]. By lacunary reasons, this spectral sequence collapses on the second page, and so we deduce H∗(U(2)) ≅ Λ[c1,c3] H ∗ …

  6. Equation of a rectangle - Mathematics Stack Exchange

    Oct 2, 2011 · I need to graph a rectangle on the Cartesian coordinate system. Is there an equation for a rectangle? I can't find it anywhere.

  7. Expectation of Minimum of $n$ i.i.d. uniform random variables.

    Apr 25, 2017 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Upvoting indicates when questions and answers are useful. What's reputation …

  8. Difference between "≈", "≃", and "≅" - Mathematics Stack Exchange

    In mathematical notation, what are the usage differences between the various approximately-equal signs "≈", "≃", and "≅"? The Unicode standard lists all of them inside the Mathematical …

  9. The sequence of integers - Mathematics Stack Exchange

    May 9, 2016 · Prove that the sequence $\\{1, 11, 111, 1111, .\\ldots\\}$ will contain two numbers whose difference is a multiple of $2017$. I have been computing some of the immediate …

  10. Typo on Wikipedia? Dimension of - Mathematics Stack Exchange

    Jan 29, 2015 · Wikipedia states: "The unitary group U(n) U (n) is a real Lie group of dimension n2 n 2. " There seem to be two typos: one, unitary matrices are complex. So it should be a …

  11. When is the group of units in $\\mathbb{Z}_n$ cyclic?

    Let Un U n denote the group of units in Zn Z n with multiplication modulo n n. It is easy to show that this is a group. My question is how to characterize the n n for which it is cyclic. Since the …