## All Questions

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### Does this ODE system have solution?

Let $A(t)$ and $B(t)$ be matrices with each element in $L^\infty(0,T).$ Let $A(t)$ have an inverse. I know nothing else about this inverse. Let $c(t)$ be a vector in $L^2(0,T).$ …
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### Definition of the homological Chern character

There is a homological Chern character $ch_\ast \colon K_\ast(X) \to H_\ast(X)$ for $X$ a smooth, compact manifold. I found only one definition of it (in the paper "K-Homology and …
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### Accessible problems on classical groups over complex or real numbers.

I am a undergraduate student doing project with my professor in group theory. I am Looking for some accessible problems for undergraduate on Classical groups over complex or real n …
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### Effective Chebotarev without Artin’s conjecture

Iwaniec and Kowalski, in their famous book Analytic Number Theory states a strong form of the effective Chebotarev density theorem page 143, and prove it assuming both GRH for Arti …
In some combinatorial research I came across the following nested sequence: $${a_n}={1,1,3,1,7,3,17,1,35,7,77,3,157,17,331,1,663,35,1361,7,2729,77,5535,3,11073, \dots}$$ which is n …