2019
Dec
24

# Genadi Levin (HUJI) - The Lyapunov exponent of rational maps

12:00pm to 1:00pm

Edmond J. Safra Campus The Hebrew University of Jerusalem

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2019
Dec
24

12:00pm to 1:00pm

2019
Dec
05

2:30pm to 3:30pm

Manchester Building (Hall 2), Hebrew University Jerusalem

Hamiltonian Floer cohomology was invented by A. Floer to prove the Arnold conjecture: a Hamiltonian diffemorphism of a closed symplectic manifold has at least as many periodic orbits as the sum of the Betti numbers. A variant called Symplectic cohomology was later defined for certain non compact manifolds, including the cotangent bundle of an arbitrary closed smooth manifold. The latter is the setting for classical mechanics of constrained systems. Read more about Colloquium: Yoel Groman (HUJI) - Floer homology of the magnetic cotangent bundle

2019
Nov
06

11:00am to 1:00pm

Ross building - Room 63

I will define the notions described in the title, and ask if they are equivalent. I will present a proof showing that they are in case the theory is NIP. The proof is essentially the proof of the fact that the lack of distality is witnessed by a sequence of singletons by Pierre Simon’s.

2019
Nov
18

2:30pm to 3:30pm

Ross 70

Title: Mordell-Lang and Integral Points on Abelian Varieties in Characteristic p

2019
Nov
04

Repeats every week every Monday until Sun Dec 15 2019 .

1:00pm to 2:00pm1:00pm to 2:00pm

1:00pm to 2:00pm

1:00pm to 2:00pm

1:00pm to 2:00pm

1:00pm to 2:00pm

Mathematics, Faculty Lounge

This semester will be devoted to resolution of singularities -- a process that modifies varieties at the singular locus so that the resulting variety becomes smooth. For many years this topic had the reputation of very technical and complicated, though rather elementary.

In fact, the same resolution algorithm can be described in various settings, including schemes, algebraic varieties or complex analytic spaces.

In fact, the same resolution algorithm can be described in various settings, including schemes, algebraic varieties or complex analytic spaces.

2019
Nov
11

2019
Dec
10

2:00pm to 3:00pm

Abstract: We consider generic translation flows corresponding to Abelian differentials on flat surfaces of genus $g\ge 2$. These flows are weakly mixing by the Avila-Forni theorem. Recently Forni obtained Hoelder estimates on spectral measures for almost all translation flows, following earlier work by Bufetov and myself in genus two. Combining Forni's idea with our methods, we extended our proof to the case of arbitrary genus $g\ge 2$. It is based on a vector form of the Erd\H{o}s-Kahane argument, which I will try to explain.

This is a joint work with A. Bufetov.

2019
Oct
30

11:00am to 1:00pm

Ross 63

Partition theorems have the following form. Let "regular" be some notion for a structure S; theorem: for every finite partition of S there is a "regular" set inside a cell of the partition.

2019
Nov
19

2019
Nov
05

1:00pm to 2:30pm

Room 209, Manchester Building, Jerusalem

I will survey recent progress in defining and computing categorical enumerative invariants, analogues of Gromov-Witten invariants defined directly from a cyclic A_infinity category and a choice of splitting of the Hodge filtration on its periodic cyclic homology. A proposed definition of such invariants appeared in 2005 in work of Costello, but the original approach had technical problems that made computations impossible.

2019
Nov
07

4:00pm to 5:15pm

Ross 70

Today, in our modern world, we perceive the physical universe in mathematical terms; whether degrees on longitude and latitude on earth, or in units of space-time beyond our earthly horizons. This talk will present two ancient cuneiform tablets from Babylonia which offer a geometric impression of the physical world as experienced by ancient Babylonians. Comparisons will be made with a range of other ancient mathematical, geographic, and astronomical materials from the cuneiform Ancient Near East.

2019
Nov
14

2019
Nov
03

2019
Nov
07

10:00am to 11:00am

Ross 70

Abstract: A subgroup is said to be almost normal if it is commensurable

to all of its conjugates. Even though there may not be a well-defined

quotient group, there is still a well-defined quotient space that admits

an isometric action by the ambient group. We can deduce many geometric

and algebraic properties of the ambient group by examining this action.

In particular, we will use quotient spaces to prove a relative version

of Stallings-Swan theorem on groups of cohomological dimension one. We

to all of its conjugates. Even though there may not be a well-defined

quotient group, there is still a well-defined quotient space that admits

an isometric action by the ambient group. We can deduce many geometric

and algebraic properties of the ambient group by examining this action.

In particular, we will use quotient spaces to prove a relative version

of Stallings-Swan theorem on groups of cohomological dimension one. We

2019
Nov
25

10:00am to 12:00pm

C-400, CS building

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