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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 |
Jun
4 |
asked | The space of polynomials with all real roots |
Apr
27 |
comment |
What is the fan of the toric blow-up of $\mathbb{P}^3$ along the union of two intersecting lines?
Well, $w \equiv 0$ on both $C_i$, so definitely $wz$ is in the ideal, no? |
Apr
23 |
comment |
induced map on tangent bundles from blow up morphism
Note that tangent bundle is dual to cotangent bundle. Since the cotangent space at a point $y \in Y$ is simply $m_y/m_y^2$, where $m_y$ is the ideal of $y$, given a morphism $\phi: Y \to Z$ such that $\phi(y) = z$, you get an induced map from the cotangent space at $z$ to the cotangent space at $y$. Now dualize. |
Feb
28 |
comment |
Blowing-up a point in the singular locus
Can you please add the definition of an ordinary singularity? |
Feb
24 |
comment |
“Exceptional components” of the exceptional divisor of a blow up
@KarlSchwede: yes, $\overline{\lbrace P \rbrace} \neq V$, and you are right in all other counts. |
Feb
24 |
asked | “Exceptional components” of the exceptional divisor of a blow up |
Jan
20 |
accepted | Is being reduced a generic property of schemes? |