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Jan
24
comment How do i prove that the reduced row echelon form is unique?
A short proof of uniqueness of RRE form by induction on the number of columns is given here: citeseerx.ist.psu.edu/viewdoc/…
Jan
20
reviewed Approve Is reducing factoring of integers to finding a polynomial which takes a perfect square value useful?
Jan
19
revised The bijection between central characters and linkage classes over a semisimple Lie algebra
edited title
Jan
19
comment The bijection between central characters and linkage classes over a semisimple Lie algebra
What exactly do you mean by the Harish-Chandra theorem? For some people (e.g. en.wikipedia.org/wiki/Harish-Chandra_isomorphism ) the HC theorem is exactly the result "$\chi_\lambda = \chi_\mu$ iff..." you stated.
Jan
19
reviewed Approve recurrence relation with variable coefficients
Jan
15
comment Example $g\circ f=id_A$ but $f\circ g\neq id_B$
As it stands you can take $A=B$ and $f=g=\operatorname{id}_A$. Do you maybe mean $f\circ g \neq \operatorname{id}_B$?
Jan
5
reviewed Approve $f : A \to B$ be a ring homomorphism, projection map $ p: B \to B/M$, Is $p(f(A))/M$ isomorphic to $A/M$?
Jan
5
reviewed Approve Is a function changed into another function by a change of variables?
Jan
2
awarded  Revival
Jan
2
revised Corestriction map in lie algebra cohomology
added 382 characters in body
Jan
2
answered Corestriction map in lie algebra cohomology
Jan
2
revised probability: continuous uniform distribution mean by symmetry
deleted 51 characters in body
Jan
2
awarded  Yearling
Jan
2
answered probability: continuous uniform distribution mean by symmetry
Dec
24
comment Good approximation for $\binom{N}{\frac{N}{2}}$
See en.wikipedia.org/wiki/Central_binomial_coefficient for some asymptotics
Dec
24
comment What is $\Lambda^{i}$ in the “Show that the highest weight of $\Lambda^{i}V $ is $\omega_{i}”$?
Tobias is right, see en.wikipedia.org/wiki/Exterior_algebra or a book like Fulton and Harris Representation Theory.
Dec
24
comment Chevron Symbols in Commutator
Another name for $\langle \rangle$ is angle brackets.
Dec
24
comment Symmetric algebra
If $K$ is a commutative ring and $V$ is a $K$-module, it might not have a basis because it might not be a free module. So you can't even talk about $K[v_1,\ldots,v_n]$ in that generality. Is that what you mean?
Dec
22
comment Property of eigenvectors in linear mapping
$L$ and the identity map $U$ into $U$. What happens if you apply $L-\lambda I$ to $u+v$, where $\lambda$ is one of the eigenvalues?
Dec
20
comment Does $\int_{0}^{1}x^nf(x)\, dx=0$ imply that $f=0$ a.e. without assuming $f \in C[0,1]$?
mathoverflow.net/questions/32369/functions-orthogonal-to-xn