bio | website | |
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location | ||
age | ||
visits | member for | 5 years, 4 months |
seen | 18 hours ago | |
stats | profile views | 778 |
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? |
Jan 19 |
comment |
Is being reduced a generic property of schemes?
Dear Sándor, not sure I get the example: your $Y$ is nowhere reduced, so it does not satisfy the assumption of being generically reduced. |
Jan 19 |
asked | Is being reduced a generic property of schemes? |
Nov 5 |
awarded | Yearling |
Aug 25 |
comment |
A question on resolution of singularities
Is it true that $\pi$ restricts to an isomorphism on $Y\setminus \pi^{-1}(\{p\} \cup L)$, so that it does not change any point on $\mathbb{P}^4 \setminus (\{p\} \cup L)$? If this is true then the answer is clearly negative. |
Jul 2 |
awarded | Curious |
Jun 29 |
revised |
What is the probability that a random sequence of polynomials is regular?
deleted 5 characters in body |
Jun 26 |
answered | What is the probability that a random sequence of polynomials is regular? |
Mar 25 |
comment |
Jacobian of an injective mapping
@user126154: you are right. I saw in the question $J_f(a) < 0$, and immediately interpreted $J_f$ as the Jacobian determinant. |
Mar 25 |
comment |
Jacobian of an injective mapping
@user126154: I meant the function $\phi: \mathbb{R} \to \mathbb{R}$ defined by $\phi(t) := J_f(a + t(b-a))$. |
Mar 25 |
comment |
Jacobian of an injective mapping
For the 2nd question apply the intermediate value theorem to $J_f$-restricted to the line joining a and b. |
Mar 12 |
accepted | Why the name “variety” and the notation “V” for zeroes of polynomials? |
Mar 11 |
awarded | Nice Question |
Mar 11 |
asked | Why the name “variety” and the notation “V” for zeroes of polynomials? |
Mar 10 |
comment |
Normal polytopes - counterexample?
Regarding the 'related question': M = dim(P) -1 suffices (Theorem 2.2.12, Toric Varieties, Cox-Little-Schenck). |
Feb 19 |
comment |
What are some mathematical sculptures?
@ToddTrimble: Hi Todd, it had a "coppery" look, but not sure if it was mixed with anything else. |
Feb 4 |
accepted | How many of the true sentences are provable? |