bio | website | sites.google.com/site/… |
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location | Italy | |
age | ||
visits | member for | 4 years, 11 months |
seen | Jun 28 at 6:15 | |
stats | profile views | 6,744 |
Mathematician, researching in Algebraic Geometry and related topics.
Jun 27 |
comment |
Mathematics equivalent of Feynman's Lectures in Physics?
@Todd Trimble: I never said I'm agreeing with him :-) |
Jun 27 |
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Mathematics equivalent of Feynman's Lectures in Physics?
Indeed, in his usual provocative style, he used to say "Physics is to sex as Mathematics is to masturbation" :-) |
Jun 27 |
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Mathematics equivalent of Feynman's Lectures in Physics?
In my opinion "meaning of things" in Mathematics has a much broad sense than in Physics (where it essentially means "explaination of natural phenomena"). So it is very difficult (if not impossible) to write a treatise in the spirit of Feyman's |
Jun 25 |
revised |
Theta characteristics of genus$\geq3$ curve
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Jun 25 |
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Theta characteristics of genus$\geq3$ curve
Corrected, thanks. |
Jun 25 |
revised |
Theta characteristics of genus$\geq3$ curve
added 181 characters in body |
Jun 25 |
revised |
Theta characteristics of genus$\geq3$ curve
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Jun 25 |
revised |
Theta characteristics of genus$\geq3$ curve
added 619 characters in body |
Jun 25 |
answered | Theta characteristics of genus$\geq3$ curve |
Jun 24 |
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Complex structure on $S^6$ gets published in Journ. Math. Phys
I do not think it is the wrong forum. This is not a preprint, it is a peer-reviewed and published paper claiming to solve a very famous and long-standing problem. It is completely natural to wonder whether it is actually correct or not. At any rate, I agree that the question could be improved. |
Jun 24 |
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Kummer theory and ramified covers
You can use the same procedure, cant'you? Call $B$ your set of points and let $f$ be a generator of the extension. If $f$ does not vanish at $B$ you are done; otherwise, replace $f$ with $f+\pi^*g$, where $g \in K(Y)$ is any rational function non vanishing at the points of the set $\pi(B)$. In fact, if $b \in B$ we have $$(f+\pi^*g)(p) = f(p) + g(\pi(b)) = g(\pi(b)) \neq 0.$$ |
Jun 23 |
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Kummer theory and ramified covers
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Jun 23 |
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Kummer theory and ramified covers
Assume that your generator $f$ vanishes only at the ramification points of $\pi \colon X \to Y$. If $g \in K(Y)$ is such that $g$ does not vanish on the branch locus of $\pi$, then $f + \pi^*g$ is a generator of the extension that does not vanish on the ramification locus of $\pi$. |
Jun 21 |
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Kummer theory and ramified covers
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Jun 21 |
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Kummer theory and ramified covers
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Jun 21 |
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Kummer theory and ramified covers
added 148 characters in body |
Jun 21 |
answered | Kummer theory and ramified covers |
Jun 16 |
awarded | Enlightened |
Jun 15 |
revised |
Non-algebraic K3 surfaces in characteristic $p$
added 4 characters in body |
Jun 15 |
awarded | Nice Answer |