8:00am 


9:00am 


10:00am 


11:00am 
[11:00am] Subhajit Ghosh: IISc Bengaluru.
 Description:
 Combinatorics seminar.
Speaker: Subhajit Ghosh.
Affiliation: IISc Bengaluru.
Date and Time: Wednesday 04 March, 11:00 am  12:30 pm.
Venue: Ramanujan Hall, Department of Mathematics.
Title: Total variation cutoff for the fliptranspose top with random shuffle.
Abstract:
Abstract. We consider a random walk on the hyperoctahedral
group Bn generated by the signed permutations of the forms (i, n)
and (−i, n) for 1 ≤ i ≤ n. We call this the fliptranspose top
with random shuffle on Bn. We find the spectrum of the transition
probability matrix for this shuffle. We obtain the sharp mixing
time for this shuffle by proving total variation cutoff phenomenon
with cutoff time n log n.


12:00pm 

1:00pm 


2:00pm 
[2:00pm] Bata Krishna Das: IIT Bombay
 Description:
 Analysis seminar.
Speaker: Bata Krishna Das.
Affiliation: IIT Bombay.
Date and Time: Wednesday 04 March, 02:00 pm  03:00 pm.
Venue: Ramanujan Hall, Department of Mathematics.
Title: Model of operators and their characteristic functions.
Abstract: In this talk, using Sz.Nagy and Foias isometric dilation, we will describe functional models of a class of operators. This will further lead us to define their characteristic functions which are complete unitary in variants. We will also discuss the connection between invariant subspace problem and factorization of characteristic functions. If time permits we will see a recently developed multivariate analogue of these notions.


3:00pm 


4:00pm 
[4:00pm] Siddhartha Bhattacharya: TIFR Mumbai: Mathematics Colloquium
 Description:
 Mathematics Colloquium.
Speaker: Siddhartha Bhattacharya.
Affiliation: TIFR Mumbai.
Date and Time: Wednesday 04 March, 04:00 pm  05:00 pm.
Venue: Ramanujan Hall, Department of Mathematics.
Title: Translational tilings of the plane.
Abstract: A set $A\subset {\mathbb R}^2$ is said to be a translational
tile if ${\mathbb R}^2$ can be expressed as a disjoint union of
translated copies of $A$. In this talk we will discuss the connection
between such tiles and measure preserving dynamical systems. We will show
that if the underlying set $A$ satisfies a certain regularity condition
then the question whether $A$ tiles the plane is decidable.


5:00pm 


6:00pm 

