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 Jan2 revised double angle condition added 41 characters in body Jan2 comment If A is an open set does A the complement of A have to be closed? I know the opossite is true by definition, is this? A set is closed if its complement is open. Jan2 revised Does order of qualifiers matter in FOL formula? added 48 characters in body Jan2 comment How does $\sum_{k=0}^n (pe^t)^k{n\choose k}(1-p)^{n-k} = (pe^t+1-p)^n$? en.wikipedia.org/wiki/Binomial_theorem#Statement_of_the_theorem Jan2 revised Integral $\int_0^\infty \frac{\sqrt[3]{x+1} - \sqrt[3]{x}}{\sqrt{x}} \, \mathrm dx$ added 43 characters in body Jan2 reviewed Approve A p-Sylow subgroup of a subgroup is a p-sylow subgroup of the group Jan2 comment The set of the roots of all polynomials in one variable with integer coefficients What have you tried so far? Jan2 revised Poincaré inequality by capacity estimate. added 80 characters in body; edited title Jan2 reviewed Approve Alice and Bob number sum game Jan2 revised Construct an injective function that takes a function $\mathbb{N} \to \mathbb{R}$ and outputs an injective function $\mathbb{N} \to \mathbb{R}$ edited body Jan2 answered Does order of qualifiers matter in FOL formula? Jan2 revised Does order of qualifiers matter in FOL formula? added 126 characters in body Jan2 reviewed Reviewed Find the cardinality of $\mathbb{F}_2$ adjoin a root of $X^4 + X + 1$ Jan2 revised Find the cardinality of $\mathbb{F}_2$ adjoin a root of $X^4 + X + 1$ added 42 characters in body; edited tags Jan1 reviewed Approve Use AM-GM to prove upper bound. Jan1 comment Integrate $\int {1\over x^2(x-1)^3} \, dx$ @user1904218: You don't actually (explicitly) need substitution, you can use the chain rule which gives $((x-1)^{-1})' = -(x-1)^{-2}$ immediately. Jan1 revised Integrate $\int {1\over x^2(x-1)^3} \, dx$ added 204 characters in body Jan1 answered Integrate $\int {1\over x^2(x-1)^3} \, dx$ Jan1 awarded Revival Jan1 revised Understanding a “matrix repræsentation” edited body