# Past Events

Date/Time: Friday, December 8, 2017 - 10:30

Speaker: Santu Pal, SMS, NISER

Title: Cryptanalysis of stream cipher

Abstract: Stream cipher plays an important role in cryptography. The basic component of stream cipher is Linear Feedback Shift Registrar. Here we will discuss about the general construction of a LFSR based stream cipher and the cryptanalysis of stream cipher.

Date/Time: Tuesday, December 5, 2017 - 10:30 to 11:30

Venue: Seminar Room, School of Mathematical Sciences

Speaker: Riddhi Shah, JNU

Title: Dynamics of Distal Actions on Groups

An automorphism T of a locally compact group is said to be distal if the closure of the T-orbit of any nontrivial element stays away from the identity. We discuss some properties of distal actions on groups. We will also relate any distal group with the behaviour of convolution powers of...

Date/Time: Thursday, November 30, 2017 - 10:30 to 11:30

Speaker: Mr. Sayan Ghosh, IIT Bombay

Title: The Analysis of Incomplete Contingency Tables

Abstract: The analysis of incomplete contingency tables is an interesting problem, which is also of practical interest. In this talk, we propose various missing data models for analyzing arbitrary three-way and multidimensional incomplete tables, and study estimation and testing under them. We...

Date/Time: Thursday, November 23, 2017 - 15:30

Speaker: Nilkantha Das, NISER

Title: Riemann Roch Theorem

The Riemann-Roch Theorem is the foundation of the theory of algebraic curves. It gives a precise answer for the dimension of the space L(D) for a divisor D of an algebraic curve. The qualitative information that a Riemann surface is an algebraic curve is seen to be equivalent to more...

Date/Time: Thursday, November 23, 2017 - 11:00 to 12:00

Venue: Seminar Room, School of Mathematical Sciences

Speaker: Aprameyan Parthasarathy, Universität Paderborn

Title: Boundary values, resonances and scattering poles on rank one symmetric spaces

In this talk, we will report on recent work (with J. Hilgert and S. Hansen, Paderborn) relating resonances and scattering poles on Riemannian symmetric spaces of rank one. We use boundary values in the sense of Kashiwara and Oshima to show that resonances and scattering poles coincide, along...

Date/Time: Thursday, November 23, 2017 - 09:30 to 10:30

Speaker: Ramprasad Kale, 4th Year student, SMS, NISER

Title: Some Topics in Sequential Estimation

Confidence intervals constructed from a fixed-sample size procedure may sometimes be too wide to be of any practical use. Hence, to avoid such a problem, it is desirable to construct confidence intervals with fixed-width. G. B. Dantzig (1940) showed that there did not exist any fixed sample size...

Date/Time: Wednesday, November 22, 2017 - 15:30

Speaker: Anantadulal Paul, NISER

Title: Counting complex curves with singularity in CP^2

The study of of degree d curves in $\mathbb{CP}^2$ is one of the interesting topic which arises in the context of Enumerative Geometry. The specific problem, which I will talk about, can be stated as follows:

Let $\mathbb{CP}^2$ be a compact complex surface and $L \rightarrow \mathbb{CP}^...

Date/Time: Wednesday, November 22, 2017 - 14:00 to 15:00

Venue: Conference Room, School of Mathematical Sciences

Speaker: Sabyasachi Mukhopadhyay, University of Hohenheim

Title: Modelling spatio-temporal variation in rainfall using a hierarchical Bayesian regression model

Date/Time: Wednesday, November 22, 2017 - 11:00 to 12:00

Venue: conference Room, School of Mathematical Sciences

Speaker: Ananta Kumar Majee, University of Tübingen

Title: Rate of convergence of a semi-discrete finite difference scheme for stochastic balance laws driven by Levy noise

Date/Time: Tuesday, November 21, 2017 - 11:30

Speaker: Abhrojyoti Sen, SMS, NISER

Title: Vanishing Pressure Limit For a Non-strictly Hyperbolic System

In this talk we will be discussing about vanishing pressure limit for the equation

u_t + (u^2/2)_x = 0

ρ_t + (ρu)_x = 0,

with initial data

u(x, 0) = u_0(x),

ρ(x, 0) = ρ_0(x),

where u is the velocity component and ρ is the density component. This equation...

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