meta user
network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 2 years, 1 month |
| seen | Oct 30 '12 at 16:55 | |
| stats | profile views | 36 |
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Oct 8 |
asked | How do I break MAGMA? |
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Oct 5 |
accepted | How to iterate over power set in MAGMA? |
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Oct 5 |
revised |
How to iterate over power set in MAGMA? added 141 characters in body |
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Oct 5 |
asked | How to iterate over power set in MAGMA? |
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Sep 11 |
accepted | Picking out columns from a matrix using MAGMA |
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Sep 9 |
asked | Picking out columns from a matrix using MAGMA |
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May 23 |
revised |
Extending an ideal of a polynomial ring to a polynomial ring with more indeterminates. Is it a tensor product? deleted 85 characters in body |
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May 16 |
accepted | Is the image of a tensor product equal to the tensor product of the images? |
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May 16 |
comment |
Is the image of a tensor product equal to the tensor product of the images? Thanks a lot for great answer. I don't quite see what the unique injection $\mathbb{Z}/2\mathbb{Z}\rightarrow\mathbb{Q}/\mathbb{Z}$ is though...could you please tell me? And what if all the modules $A,A',B,B'$ are free $S$- modules (even finitely generated), do we then have $$\operatorname{im}(\phi\otimes\psi)=\operatorname{im}(\phi)\otimes_{S}\operatorname{im}(\psi)?$$ |
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May 16 |
asked | Is the image of a tensor product equal to the tensor product of the images? |
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May 5 |
comment |
Showing that the Taylor series of $f(x)=\frac{1}{\sqrt{1+x}}$ converges to $f$ on (I think) the interval (-1,1]. Well, thanks a lot. This is a first year calculus exercise though, and neither complex analysis nor binomial coefficients involving non-natural numbers are part of the curriculum...far from it:) |
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May 5 |
asked | Showing that the Taylor series of $f(x)=\frac{1}{\sqrt{1+x}}$ converges to $f$ on (I think) the interval (-1,1]. |
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May 5 |
accepted | Manipulation of some power series (probably integration or derivation). |
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May 4 |
comment |
Manipulation of some power series (probably integration or derivation). Well, but using the series for $ln(1+x)$ and $ln(1-x)$ together with $\ln(a/b)=\ln(a)-\ln(b)$, which I had already tried, doesn't yield the deisred identity. I am pretty sure one is supposed to use the sum for $\frac{1}{1-x^2}$ mentioned above. And the absolute values, pointless though they are, I think may be a hint that one is supposed to integrate both sides of something, since \integral 1/y = ln|y| + C. But I still have no idea how to solve this exercise. |
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May 4 |
asked | What happens to the sequence $a_n=\frac{3\cdot5\cdot7\cdot\ldots\cdot(2n-1)}{2\cdot4\cdot6\cdot\ldots\cdot2n}$ as $n$ tends to $\infty$? |
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May 3 |
asked | Manipulation of some power series (probably integration or derivation). |
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Apr 28 |
awarded | Commentator |
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Apr 28 |
comment |
When is every spanning tree of a connected graph the union of spanning trees of its subgraphs? In general, if the proposition holds for some $\{H_i\}$, then it holds for any "coarser partition" of $\{H_i\}$ as well. |
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Apr 28 |
comment |
When is every spanning tree of a connected graph the union of spanning trees of its subgraphs? Have found some sufficient conditions for this to be true, but no necessary conditions so far. Sufficient, at least, is for each $H_i$ to be a union of blocks of $G$, in such a way that $H_1,H_2,\ldots H_r$ constitute a "partition" of the blocks of $G$. In particular, it holds whenever $H_1,H_2,\ldots H_r$ are the blocks of $G$. Can provide a proof of this if anyone is interested. Have not managed to show that this is a necessary condition (nor to find a counterexample showing that it isn't). |
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Apr 27 |
accepted | Looking for a function $f$ such that $f(i)=2(f(i-1)+f(\lceil i/2\rceil))$ |
