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Jan
3
reviewed No Action Needed Equation of a cubic function with inflection point on (0.5,0.5) and contains (0,0), (1,1)
Jan
2
comment Diagonalization versus s.d. product for non-commuting Hermitian matrices
@nomadreid: Which bases do you mean? My point was that both statement (1) and (2) are equivalent to $[A,B] \neq 0$, in case it wasn't clear. I thought you were trying to understand how one comes up with these two results.
Jan
2
revised double angle condition
added 41 characters in body
Jan
2
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.
Jan
2
revised Does order of qualifiers matter in FOL formula?
added 48 characters in body
Jan
2
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
Jan
2
revised Integral $\int_0^\infty \frac{\sqrt[3]{x+1} - \sqrt[3]{x}}{\sqrt{x}} \, \mathrm dx$
added 43 characters in body
Jan
2
reviewed Approve A p-Sylow subgroup of a subgroup is a p-sylow subgroup of the group
Jan
2
comment The set of the roots of all polynomials in one variable with integer coefficients
What have you tried so far?
Jan
2
revised Poincaré inequality by capacity estimate.
added 80 characters in body; edited title
Jan
2
reviewed Approve Alice and Bob number sum game
Jan
2
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
Jan
2
answered Does order of qualifiers matter in FOL formula?
Jan
2
revised Does order of qualifiers matter in FOL formula?
added 126 characters in body
Jan
2
reviewed Reviewed Find the cardinality of $\mathbb{F}_2$ adjoin a root of $X^4 + X + 1$
Jan
2
revised Find the cardinality of $\mathbb{F}_2$ adjoin a root of $X^4 + X + 1$
added 42 characters in body; edited tags
Jan
1
reviewed Approve Use AM-GM to prove upper bound.
Jan
1
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.
Jan
1
revised Integrate $ \int {1\over x^2(x-1)^3} \, dx $
added 204 characters in body
Jan
1
answered Integrate $ \int {1\over x^2(x-1)^3} \, dx $