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Apr
19 |
comment |
A Hartogs-type criterion for flatness
Quotients by finite group actions give counter examples in the general case, e.g. see the answer to this question: mathoverflow.net/questions/169052/… Take $U = k^2$, $V = U\setminus$origin, $Y = $ image of $V$ by the quotient map. |
Apr
13 |
comment |
Is this method of finding a “dual curve” correct?
Well, $(\Gamma^*)^* = \Gamma$, and $[a(t) : b(t):1]$ are points on $\Gamma$, so unless I am missing something, by definition of duality, the tangents to $\Gamma^*$ are precisely (modulo taking the closure) the lines $\{[x:y:1]: a(t)x + b(t)y + 1 = 0\}$. |
Mar
22 |
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A question about homogenous polynomials of degree $\frac{n(n-1)}{2}$
Can you elaborate on what can be expected to be known about $f$? E.g: do you know a factorization, and expansions of the factors (as in your example)? Can you evaluate $f$ at (finite) sets of points? |
Mar
10 |
revised |
Resolution of the $E_8$ singularity with a weighted blowup
added 1103 characters in body |
Mar
8 |
answered | Resolution of the $E_8$ singularity with a weighted blowup |
Feb
25 |
awarded | Nice Question |
Feb
3 |
awarded | Popular Question |
Nov
23 |
awarded | Nice Question |
Nov
19 |
comment |
Standard polynomials applied to matrices (bis)
How do you get a map from $M_2(\mathbb{R})$ to itself via $S_2$? Do you fix one of the factors? |
Nov
17 |
awarded | Popular Question |
Nov
5 |
awarded | Yearling |
Oct
22 |
awarded | Popular Question |
Oct
22 |
answered | Can a curve intersect a given curve only at given points? |
Oct
21 |
awarded | Enlightened |
Oct
21 |
awarded | Nice Answer |
Jun
5 |
revised |
When is $f(x^d)$ irreducible?
added 344 characters in body |
Jun
5 |
revised |
When is $f(x^d)$ irreducible?
added 75 characters in body |
Jun
5 |
answered | When is $f(x^d)$ irreducible? |
Jun
5 |
accepted | The space of polynomials with all real roots |
Jun
5 |
revised |
The space of polynomials with all real roots
added 255 characters in body |