4,786 reputation
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visits member for 3 years, 11 months
seen 6 hours ago

no mods no masters


6h
awarded  Constituent
2d
comment Use norm on $\mathbb{R}$^k to prove $\mathbb{R}$^k is complete
Perhaps "countable" should be "complete"?
Dec
12
reviewed Approve two place predicate logic
Dec
10
reviewed Approve Calculate the result of the following sequence.
Dec
9
revised Trying to understand group presentations using the example of the Dihedral group
the poster is asking about presentations, not representations
Dec
8
awarded  Caucus
Dec
8
comment Symmetric powers of modules
In Gelfand and Manin's Methods of homological algebra in the Reference Guide section they mention derived functors of non-additive functors and give references discussing symmetric/exterior powers.
Dec
8
reviewed Approve Good book for Local Fields/ Commutative algebra?
Dec
5
reviewed Approve How I can solve this equation with respect to the variable $t$?
Dec
5
reviewed Approve For $A, B$ invertible matrices of the same order, is it true that $(A^T + B^T)^{-1} = (A^T)^{-1} + (B^T)^{-1}$?
Dec
4
revised Verify Stokes' Theorem, example
apostrophe crime
Dec
2
awarded  Reviewer
Dec
2
reviewed Approve Two methods for the Nash equilibrium give different answers; which is correct?
Dec
2
reviewed Approve Does an integral operator with a symmetric integrable kernel have to be bounded on $L^2$?
Dec
2
reviewed Reject number of ways of inviting friends for dinner
Dec
2
reviewed Reject Is this limit zero as $(h,k)$ goes to $(0,0)$? $({h^2}\sin(1/h) + {k^2}\sin(1/k) )/ \sqrt{h^{2} + k^{2} } $
Dec
1
reviewed Approve What is wrong with my matrix derivation?
Nov
28
reviewed Approve How to determine without calculator which is bigger, $\left(\frac{1}{2}\right)^{\frac{1}{3}}$ or $\left(\frac{1}{3}\right)^{\frac{1}{2}}$
Nov
27
reviewed Approve let $D_n$ be the number of permutations of $\{1,2,3,…n\}$ which leave no element fixed.
Nov
27
reviewed Approve autocovariance of an ar(2) model