Henry Swanson
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 13h comment Cardinality of equivalence relations on N I just interpreted it as "I'd like to show how many ways we can partition $\mathbb{N}$, is it at least $2^{\aleph_0}$?". It feels similar in flavor to his other question. 13h answered Cardinality of equivalence relations on N 13h reviewed Looks OK How can we show that $\sum_{n=0}^{\infty}\frac{2^nn[n(\pi^3+1)+\pi^2](n^2+n-1)}{(2n+1)(2n+3){2n \choose n}}=1+\pi+\pi^2+\pi^3+\pi^4 ?$ 13h reviewed Close improper integral of exponential function that contains a square root 13h reviewed Leave Open Lagrangian method with objective function and constraints in expected value form. 13h reviewed Leave Open abstract algebra: finite fields and galois group 13h reviewed Close Ellipticity of an operator 13h reviewed Leave Open Prove that for every sufficiently large n, exists a k-paradoxical tournament on n vertices 13h reviewed Leave Open Galois extension of degree $2^n$ 13h comment What is the binary operations in $\mathbb{D}(n)$ The only way I can interpret "algebraic definition" is group presentation. Perhaps I should be more clear that the presentation is the point of the answer. 13h reviewed Close Length of the side of a regular pentagon is $a$ & length of diagonal is $b$. Value of $\frac{a^2}{b^2}+ \frac{b^2}{a^2}=$? 13h reviewed Leave Open Limit Point and Sequences Theorem 13h reviewed Close about Lebesgue integral functions 13h reviewed Leave Open if p and q are distinct primes and n=p q then there is a primitive root mod n 13h reviewed Leave Open Can you recommend a book about multivariable mathematical analysis? 13h comment Transform the equation into homogeneous equation and then solve What have you tried? 13h answered What is the binary operations in $\mathbb{D}(n)$ May 1 comment If a function maps an input to its inverse, is it bijective? What is $X$? If it's a group, then $x^{-1}$ makes sense. But if it's a topological space, what would $x^{-1}$ mean? Apr 28 comment Prove that if Aut($G$) is the trivial group, then so is $G$? Hint: for abelian groups, the map $g \mapsto g^{-1}$ is an automorphism. Apr 14 revised Solve without using quadratic formula: $\frac{4}{3x+3} = \frac{12}{x^2 - 1}$. added 207 characters in body