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Jan
2
reviewed Edit Complement of a tree $T$
Jan
2
revised Complement of a tree $T$
Added MathJax.
Jan
2
answered Complement of a tree $T$
Dec
29
revised differential forms of 2 sphere
edited tags
Dec
25
reviewed Close Closed form for $\sum_{k=1}^n\frac{1}{(2k-1)(2k+1)}$
Dec
25
revised Show that if $\omega$ is a 1-form differential, then $\left\vert\int_{C}\omega\right\vert\leq ML$
edited tags
Dec
25
answered Compact Manifold with Geodesic B0undary
Dec
15
answered Integration of $\frac {1}{1+\sin x}$
Dec
15
reviewed No Action Needed Upper bound for a number of subsets of $\{1, \dots, n\}$
Dec
13
revised Euler-Lagrange equation of a functional
edited tags
Dec
13
answered system of equations when the matrix corresponding $\det(A)=\pm1$ has integers solution
Dec
13
reviewed Approve Inversion of n x n matrix.
Dec
4
reviewed Approve Converting differential equation $x''+\sin(x)= 0$ to a system of ODEs
Dec
4
reviewed Reject An urn contains two red balls and four white balls. Sample successively five times at random and with replacement so that the trials are independent.
Dec
4
reviewed Reject Find the joint PMF of X and Y, are they independent?
Dec
4
reviewed Approve Does this series of functions converge?
Nov
28
answered Symmetric Matrix Equation
Nov
26
answered Relationship between Nullspaces
Nov
13
comment Computing the integral of a differential form in $\mathbb{R}^{2}$.
I think it would be easier to use polar coordinates $(r,\theta)$.
Oct
27
comment Einstein manifolds and topology
Yes. It really depends on your definition of Einstein manifold. You can define Einstein manifold to satisfy $Ric=kg$ for some constant $k$. Or you can define Einstein manifold to satisfy $Ric=\frac{R}{n}g$, or equivalently, the traceless Einstein tensor is zero. But they are equivalent by the Bianchi identity, at least for $n\geq 3$.