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seen Jan 9 '13 at 17:12

Nov
23
awarded  Investor
Oct
6
accepted Extention of vector bundles on projective line: $Ext^1({\mathcal O_{\mathbb{P}^1}}(n),{\mathcal O_{\mathbb{P}^1}}(m))=$??
Oct
6
comment Extention of vector bundles on projective line: $Ext^1({\mathcal O_{\mathbb{P}^1}}(n),{\mathcal O_{\mathbb{P}^1}}(m))=$??
Yes, I have. But I think that computation of $Ext^1% as extension is difficult. Are you agree?
Oct
6
asked Extention of vector bundles on projective line: $Ext^1({\mathcal O_{\mathbb{P}^1}}(n),{\mathcal O_{\mathbb{P}^1}}(m))=$??
Aug
17
accepted Is it true, that $H^1(X,\mathcal{K}_{x_1,x_2})=0$? - The cohomology of the complex curve with a coefficient of the shaeaf of meromorphic functions…
Aug
15
comment Prove that $ \frac{n}{\phi(n)} = \sum\limits_{d \mid n} \frac{\mu^2(d)}{\phi(d)} $
$\mu(d)$ and $\phi(d)$ multiplicative. Hence $\sum_{d \mid n} \frac{\mu^2(d)}{\phi(d)}$ also multiplicative. Left and right side are multiplicative. For $p^k$: $$\dfrac{p^k}{p^k-p^{k-1}}=1+\dfrac 1{p-1}$$
Aug
15
awarded  Analytical
Aug
12
accepted Summation of divergent series of Euler: $0!-1!+2!-3!+\cdots$
Aug
12
awarded  Nice Question
Aug
12
awarded  Scholar
Aug
12
accepted Define integral for $\gamma,\zeta(i) i\in\mathbb{N}$ and Stirling numbers of the first kind
Aug
11
awarded  Commentator
Aug
11
comment Summation of divergent series of Euler: $0!-1!+2!-3!+\cdots$
"For every fixed i, identify the coefficient of xi in the LHS and in the RHS." - How can this be used?
Aug
11
comment Summation of divergent series of Euler: $0!-1!+2!-3!+\cdots$
Numerical calculations in maple: for $x=0.7, n=10$ left-hand side is 0.6634301660, right-hand side is 0.6635102741.
Aug
11
comment Summation of divergent series of Euler: $0!-1!+2!-3!+\cdots$
$$\int\limits_0^{\infty}\dfrac{e^{-t}}{xt+1}dt=s_n(x)+o(x^n)$$
Aug
11
revised Is it true, that $H^1(X,\mathcal{K}_{x_1,x_2})=0$? - The cohomology of the complex curve with a coefficient of the shaeaf of meromorphic functions…
added 109 characters in body
Aug
11
revised Is it true, that $H^1(X,\mathcal{K}_{x_1,x_2})=0$? - The cohomology of the complex curve with a coefficient of the shaeaf of meromorphic functions…
deleted 42 characters in body
Aug
11
revised Is it true, that $H^1(X,\mathcal{K}_{x_1,x_2})=0$? - The cohomology of the complex curve with a coefficient of the shaeaf of meromorphic functions…
added 21 characters in body
Aug
11
revised Is it true, that $H^1(X,\mathcal{K}_{x_1,x_2})=0$? - The cohomology of the complex curve with a coefficient of the shaeaf of meromorphic functions…
added 9 characters in body; edited title
Aug
11
asked Is it true, that $H^1(X,\mathcal{K}_{x_1,x_2})=0$? - The cohomology of the complex curve with a coefficient of the shaeaf of meromorphic functions…