Events & Seminars

2018 Dec 26

Set Theory Seminar - Ur Yaar (The Modal Logic of Forcing)

2:00pm to 3:30pm

Location: 

Ross 63
Title: The Modal Logic of Forcing


Abstract: Modal logic is used to study various modalities, i.e. various ways in which statements can be true, the most notable of which are the modalities of necessity and possibility. In set-theory, a natural interpretation is to consider a statement as necessary if it holds in any forcing extension of the world, and possible if it holds in some forcing extension. One can now ask what are the modal principles which captures this interpretation, or in other words - what is the "Modal Logic of Forcing"?
2018 Dec 10

NT & AG - Sazzad Biswas

2:30pm to 3:30pm

Location: 

Ross 70

Title: Local root numbers for Heisenberg representations 


Abstract: On the Langlands program, explicit computation of the local root numbers 
(or epsilon factors) for Galois representations is an integral part.
But for arbitrary Galois representation of higher dimension, we do not
have explicit formula for local root numbers. In our recent work
(joint with Ernst-Wilhelm Zink) we consider Heisenberg representation
(i.e., it represents commutators by scalar matrices) of the Weil
2018 Dec 24

NT & AG Seminar - Ariel Weiss

2:30pm to 3:30pm

Location: 

Ross 70

Title: Irreducibility of Galois representations associated to low weight Siegel modular forms 


Abstract: If f is a cuspidal modular eigenform of weight k>1, Ribet proved that its associated p-adic Galois representation is irreducible for all primes. More generally, it is conjectured that the p-adic Galois representations associated to cuspidal automorphic representations of GL(n) should always be irreducible.
2018 Dec 03

NT & AG Seminar - Sazzad Biswas

2:30pm to 3:30pm

Location: 

Ross 70
Title: Local root numbers for Heisenberg representations

Abstract:
On the Langlands program, explicit computation of the local root numbers
(or epsilon factors) for Galois representations is an integral part.
But for arbitrary Galois representation of higher dimension, we do not
have explicit formula for local root numbers. In our recent work
(joint with Ernst-Wilhelm Zink) we consider Heisenberg representation
(i.e., it represents commutators by scalar matrices) of the Weil
2018 Nov 27

T&G: Graham Denham (Western University), Cohomological vanishing and abelian duality

2:00pm to 3:30pm

Location: 

Room 209, Manchester Building, Jerusalem
Cohomology jump loci are secondary cohomological invariants of discrete groups and topological spaces. I will describe some recent work on the cohomology jump loci of complements of unions of smooth complex hypersurfaces, and I will motivate the notion of abelian duality spaces that I introduced in joint work with Alex Suciu and Sergey Yuzvinsky. The study of such hypersurface arrangements involves a mix of combinatorics and complex geometry.
2018 Nov 27

Yan Dolinsky. A new type of stochastic target problems.

12:00pm to 1:00pm

Location: 

Coffee lounge
Abstract: I will discuss two stochastic target problem in the Brownian framework . The first problem has a nice solution which I will present. The second problem is much more complicated and for now remains open. I will discuss the challenges and connection with other fields in probability theory.
2018 Dec 12

Set Theory Seminar: Yair Hayut "Chang's Conjecture" (Part III)

2:00pm to 3:30pm

Location: 

Ross 63
Title: Chang's Conjecture (joint with Monroe Eskew) Abstract: I will review some consistency results related to Chang's Conjecture (CC). First I will discuss some classical results of deriving instances of CC from huge cardinals and the new results for getting instances of CC from supercompact cardinals, and present some open problems. Then, I will review the consistency proof of some versions of the Global Chang's Conjecture - which is the consistency of the occurrence many instances of CC simultaneously. We will aim to show the consistency of the statement: (\mu^+,\mu) -->> ( u^+,

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