bio | website | |
---|---|---|
location | Moscow | |
age | 25 | |
visits | member for | 4 years, 2 months |
seen | 18 hours ago | |
stats | profile views | 1,184 |
Jan 22 |
comment |
What is a Beilinson spectral sequence?
The general case is nicely stated in Christian Boening's paper mathematik.uni-bielefeld.de/documenta/vol-11/11.pdf |
Jan 17 |
awarded | Enlightened |
Jan 17 |
awarded | Nice Answer |
Jan 16 |
comment |
A property P of morphisms of $S$-schemes $f : X \rightarrow Y$ is local on $X$, or $Y$, or $S$ or
I would suggest taking any reasonable book on scheme theory. Say, Vakil's notes. |
Jan 16 |
comment |
Why do we need localization by Leftschetz motive?
I should point out that Borisov's counterexample does not prove Galkin-Shinder wrong. Actually, they need something less strong. |
Jan 13 |
comment |
Moving a divisor on a (reducible, non-reduced) curve
This is really neat! |
Dec 25 |
comment |
Triangulated category of singularities of quotient
The right term is "triangulated category of singularities" |
Dec 24 |
comment |
Blow-ups of $\mathbb{P}^{n-3}$ and $(\mathbb{P}^1)^{n-3}$
I like the trick with moving "extra" points, but it would still be nice to have a purely geometric construction. |
Dec 18 |
answered | On understanding Orlov's LG B model |
Dec 8 |
comment |
Properties of finite quotients of quasi-projective varieties
@Sasha Isn't $X/G$ always the categorical quotient in the quasi-projective case? |
Nov 30 |
comment |
Cartier divisor on a double cover
@LiYutong If you double this line, it's by no means equivalent to $\pi^*D$. |
Nov 21 |
answered | Hartshorne Proposition III 8.1 |
Nov 18 |
awarded | Yearling |
Oct 8 |
comment |
Soft question: beginners reference to moduli spaces
The book is indeed a brother of "Methods of Homological Algebra: Vol. II". Well, we still have drafts and, say, Behrend's lectures mentioned by Piotr. |
Oct 8 |
comment |
Lower semicontinuity of naive fiber size
This is not hard an is a typical Shafarevich-style argument. A tiny improvement to the algebraic counterpart is to state explicitly that given a normal domain $A$ and a finite extension $L$ of its field of fractions $K$ an element $u\in L$ is integral over $A$ iff its minimal polynomial is defined over $A$ (in particular, it exists). Of course, this is essentially Lemma 1. |
Oct 8 |
comment |
About $\mathbb P^1_\mathbb C$ contained in a surface
I'd say that your last paragraph is much more illuminating than doing things explicitly. |
Sep 26 |
answered | Spec of an injective ring map contains minimal primes in its image? |
Sep 26 |
comment |
pencil of quadrics consisting of singular quadrics
@MartinBright As far as I remember, Miles's brilliant thesis deals with the smooth case (allowing only the simplest cones). |
Sep 26 |
answered | pencil of quadrics consisting of singular quadrics |
Aug 27 |
answered | linear section of codimension $k+1$ of a variety of dimension $k$ |