3,377 reputation
1837
bio website jakitoimgeisterhaus.blogspot.…
location Munich, Germany
age 38
visits member for 3 years, 5 months
seen 3 hours ago

My past research interests included differential algebraic equations, nonlinear analysis and relations between symmetries and structural properties.

I recently investigated hierarchical structures, starting from group cohomology, continuing with semi-group theory and ending with lattices and universal algebra.


Oct
30
reviewed Approve How to prove this inequality $\frac{a_{1}a_{2}+a_{2}a_{3}+\cdots+a_{n-1}a_{n}}{a^2_{1}+a^2_{2}+\cdots+a^2_{n}}\le\cos{\frac{\pi}{n+1}}$
Oct
30
reviewed Approve Orbit-Stabilizer Theorem
Oct
16
reviewed Approve coordinate geometry high level problems
Oct
7
reviewed Approve infinitely many solutions to $\displaystyle x^n + y^n = z^{n+1}$
Jul
10
reviewed Close Proof that arithmetic mean is greater than geometric mean?
Jun
19
reviewed Looks OK $R[x]$ can be an integral extension of $R$?
Jun
19
reviewed Reject For $R$-modules $M,N$, what are sufficient conditions for $\operatorname{Supp}(M\otimes_R N)\subseteq \operatorname{Supp}(\operatorname{Hom}_R(M,N))$?
Jun
19
reviewed Reject Noetherian ring and prime ideal contained in an invertible maximal ideal.
Jun
19
reviewed Leave Open 3 random numbers to describe point on a sphere
Jun
19
reviewed Leave Open Ring of linear transformations modulo finite rank transformations
Jun
19
reviewed Approve An elegant description for graded-module morphisms with non-zero zero component
May
25
reviewed Approve Find a matrix $P$ that orthogonally diagonalizes $A$ and determine $P^{-1}AP$
May
13
reviewed Approve Continuous probability distribution with no first moment but the characteristic function is differentiable
May
13
reviewed Approve Finding expected value of E(Y^2)
May
3
reviewed Approve Proving a circuit of a graph will have an edge in common with a cycle of the same graph.
Mar
11
reviewed Approve Find the conjugacy classes of $D_6$
Jan
24
reviewed Approve Cauchy's Integral Theorem
Jan
15
reviewed Approve Can 18 consecutive integers be separated into two groups,such that their product is equal?
Jan
13
reviewed Approve Using the limit to prove the equivalence between two metrics
Jan
13
reviewed Approve Finding one sided limit