# Combinatorics: Michael Farber (Queen Mary), "Multi-parameter random simplicial complexes"

## Location:

Title: Multi-parameter random simplicial complexes

Edmond J. Safra Campus The Hebrew University of Jerusalem

2018
Apr
30

11:00am to 12:30pm

IIAS Eilat hall, Feldman building, Givat Ram

Speaker: Michael Farber, Queen Mary

Title: Multi-parameter random simplicial complexes

2018
May
07

11:00am to 12:30pm

IIAS, Eilat hall, Feldman bldg, Givat Ram

Speaker: Zur Luria, ETH

Title: New bounds for the n-queen's problem

Abstract:

The famous n-queens problem asks: In how many ways can n nonattacking queens be placed on an n by n chessboard? This question also makes sense on the toroidal chessboard, in which opposite sides of the board are identified. In this setting, the n-queens problem counts the number of perfect matchings in a certain regular hypergraph. We give an extremely general bound for such counting problems, which include Sudoku squares and designs.

Title: New bounds for the n-queen's problem

Abstract:

The famous n-queens problem asks: In how many ways can n nonattacking queens be placed on an n by n chessboard? This question also makes sense on the toroidal chessboard, in which opposite sides of the board are identified. In this setting, the n-queens problem counts the number of perfect matchings in a certain regular hypergraph. We give an extremely general bound for such counting problems, which include Sudoku squares and designs.

2018
Mar
27

2018
Apr
17

2:15pm to 3:15pm

Ross 70

The miracle of entropy - that the entropy of a measure preserving transformation calculated forward in time (for T) and backwards in time (for T^{-1}) are equal - is, depending on point of view and the definition used, either a triviality or highly surprising. Entropy theory (of Z-actions) plays a key role in analyzing the rigidity of algebraic (diagonalizable) Z^k actions; I show how a strong version of this symmetry property of entropy is useful in studying the measure classification question for such actions.

Joint work with Manfred Einsiedler.

2018
Mar
19

2018
Apr
24

1:00pm to 2:30pm

Room 63, Ross Building, Jerusalem, Israel

I will explain the notion of a homotopy quotient of an operad providing different examples of operads of compactified moduli spaces of genus zero curves with marked points: including the space of complex curves (math.arXiv:1206.3749), the real loci of the complex one (arXiv:math/0507514) and the noncommutative …

2018
Apr
10

1:00pm to 2:30pm

Room 110, Manchester Building, Jerusalem, Israel

Salmon and Cayley proved the celebrated 19th century result that a smooth cubic surface over the complex numbers contains exactly 27 lines. By contrast, the count over the real numbers depends on the surface, and these possible counts were classified by Segre. A number of researchers have recently made the striking observation that Segre’s work shows a certain signed count is always 3. In my talk, I will explain how to extend this result to an arbitrary field.

2018
Mar
27

2012
Nov
25

4:00pm to 6:00pm

Elath Hall, 2nd floor, Feldman Building, Edmond J. Safra Campus

We consider the problem of maximizing the revenue from selling a number of goods (or items). In this talk we will focus on approximation results and on the "menu-size" as a measure of auction complexity which affects the revenue. * All the relevant concepts will be introduced in the talk.* The talk is mostly independent of the talk given earlier this year.

2012
Nov
11

4:00pm to 6:00pm

Elath Hall, 2nd floor, Feldman Building, Edmond J. Safra Campus

Guided by several key examples, we formulate a definition of essential sequential equilibrium for multi-stage games with infinite type sets and infinite action sets, and we prove its general existence.

2012
Nov
04

4:00pm to 6:00pm

Elath Hall, 2nd floor, Feldman Building, Edmond J. Safra Campus

We discuss a new class of indices taking into account agents'preferences to coalesce.An axiomatization of these indices are presented.These indices are used to evaluate power distribution in Russian parliament in new era and in Empire period, in the Reichstag of Weimar Republic, in IMF, in Russian banks.

2012
Oct
28

4:00pm to 6:00pm

Elath Hall, 2nd floor, Feldman Building, Edmond J. Safra Campus

We consider the problem of maximizing the revenue from selling a number of goods to a single buyer. In this talk we will focus on the need for randomization (which arises only when there are multiple goods), and on the "menu-size" as a measure of auction complexity which affects the revenue. (All the relevant concepts will be introduced in the talk.) Read more about Game Theory & Math Economics: Sergui Hart - "Much Too Good To Be True: Lotteries and the Complexity of Auctions"

2018
May
09

12:00pm to 1:00pm

Ross building, room 70

Title: On some heavy-tail phenomena occurring in large deviations

2018
Mar
21

2016
Jan
20

11:00am to 12:45pm

Ross building, Hebrew University (Seminar Room 70A)

Abstract: One of the first applications of model categories was Quillen homology. Building on the notion of Beck modules, one defines the cotangent complex of an associative or commutative (dg)-algebras as the derived functor of its abelianization. The latter is a module over the original algebra, and its homology groups are called the (Andre'-)Quillen homology. The caveat of this approach is that the cotangent complex is not defined as a functor on the category of all algebras.

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