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2d
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
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