bio | website | |
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location | ||
age | ||
visits | member for | 5 years |
seen | yesterday | |
stats | profile views | 750 |
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? |
Feb 1 |
awarded | Enlightened |
Feb 1 |
awarded | Nice Answer |
Jan 31 |
comment |
Is the induced ring homomorphism surjective for a finite injective morphism between affine varieties?
Just wanted to add that in your first statement above, "affine" is not necessary. Essentially the same argument shows that "a finite bijective morphism f:X→Y between varieties where Y is normal must be an isomorphism." |
Jan 31 |
revised |
Is the induced ring homomorphism surjective for a finite injective morphism between affine varieties?
added 428 characters in body |
Jan 31 |
answered | Is the induced ring homomorphism surjective for a finite injective morphism between affine varieties? |
Nov 28 |
comment |
Computing fundamental groups of the complement of plane curves
@Jason: I see I was being dense. Thanks again. |