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awarded  Nice Answer
Jul
20
reviewed Reject suggested edit on How do I begin proving this binomial coefficient identity?
Jul
20
reviewed Approve suggested edit on Differentiation in Banach spaces
Jul
20
revised Formal construction of $\mathbb Q$: interpretation and equality of elements
edited tags
Jul
19
comment prove that if $p(x)\in R[x]$ is reducible over $F[x]$ then $p(x)$ is reducible over $R[x]$.
I personally like Algebra by Hungerford.
Jul
19
comment prove that if $p(x)\in R[x]$ is reducible over $F[x]$ then $p(x)$ is reducible over $R[x]$.
The standard proof is to use Gauss Lemma and can be found in most algebra books.
Jul
17
revised If $f'(z_0)\neq 0$ then $f$ has an holomorphic inverse.
added 11 characters in body
Jul
17
reviewed Approve suggested edit on Plane geometry in the complex plane
Jul
16
reviewed Approve suggested edit on Solving right triangle given the area and one angle
Jul
16
accepted Confusion regarding PBW theorem
Jul
16
accepted $\mbox{Im }A\oplus \ker A^t = V$
Jul
14
reviewed Looks OK How to solve this differential equation sinusoidal?
Jul
14
reviewed Looks OK $ \int \frac{1}{(x-a)(x+b)} dx $
Jul
14
reviewed Approve suggested edit on How to solve this recursive integral?
Jul
14
revised Show that a matrix has positive determinant
deleted 1 character in body
Jul
14
accepted Projections $P$ and $Q$ such that $I-(P+Q)$ is invertible.
Jul
13
comment Show that a matrix has positive determinant
@DiegoMath Yes, for every $1\le j\le n$. That is, sum of each column is positive.
Jul
13
revised Show determinant of matrix is non-zero
deleted 782 characters in body
Jul
13
asked Show that a matrix has positive determinant
Jul
13
asked Projections $P$ and $Q$ such that $I-(P+Q)$ is invertible.