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250419
14:00, Seminar Hall
On understanding Neural Circuit Computation
Venkatakrishnan Ramaswamy
NCBS, Bangalore. Abstract In this talk, I will describe some of my work in building theory to
understand neural circuit computation in the brain. I will talk about
two different lines of work. The talk will be selfcontained, in that
no Neuroscience background will be assumed.
Neuroscience is witnessing extraordinary progress in experimental
techniques, especially at the neural circuit level. These advances are
largely aimed at enabling us to understand how neural circuit
computations mechanistically *cause* behavior. Here, using techniques
from Computational Complexity Theory, we examine how many experiments
are needed to obtain such an empirical understanding. It is proved,
mathematically, that establishing the most extensive notions of
understanding need exponentiallymany experiments in the number of
neurons, in general, unless P=NP. Worse still, the feasible
experimental regime is one where the number of experiments one can
perform grows sublinearly in the number of neurons, suggesting a
fundamental impediment to such an understanding. Determining which
notions of understanding are algorithmically tractable in what
contexts, thus, becomes an important new direction in Neuroscience.
The second line of work concerns building theory to understand how the
structure of neuronal networks constrain computation in them. Neurons,
primarily, communicate with each other using sequences of
stereotypical action potentials or spikes, which are called spike
trains. Here, we ask what spiketrain to spiketrain mappings are
rendered impossible by virtue of the structure of networks. For
acyclic networks, we show multiple results of this form. Our neurons
are abstract mathematical objects satisfying a few axioms. We also
show an instance of a case (depth two networks) where one cannot infer
more results of this form, unless more axioms are assumed for our
neurons.
Forthcoming Seminars

260419
2.00 pm, Lecture Hall 802
Coherent States in QCD(Abstract)
P.V. Athira
Chennai Mathematical Institute.
Past Seminars (this year)

230419
3.45 pm  4.30 pm, Lecture Hall 1
An Introduction to Bounded Height Conjecture(Abstract)
Aritriya Mukhapadhyay
Chennai Mathematical Institute.

230419
3.00 pm  3.45 pm, Lecture Hall 1
On Manin Mumford Conjecture(Abstract)
Aritriya Mukhapadhyay
Chennai Mathematical Institute.

170419
3.30 pm, Seminar Hall
PolyMath14: Groups with norms(Abstract)
Apoorva Khare
Indian Institute of Science, Bangalore.

170419
MSc (Mathematics) thesis defence talks
2.00 pm, Seminar Hall
Moduli space of spatial polygons(Abstract)
Sambit Senapati
Chennai Mathematical Institute.

170419
11.50 am, Lecture Hall 5
Matrix analysis: "overview talk"
Entrywise positivity preservers: covariance estimation, symmetric function identities, and a novel graph invariant
Apoorva Khare
Indian Institute of Science, Bangalore.

170419
MSc (Mathematics) thesis defence talks
11.50 am, Seminar Hall
Jholomorphic curves and Gromov's nonsqueezing theorem(Abstract)
Paramjit Singh
Chennai Mathematical Institute.

160419
MSc (Mathematics) thesis defence talks
2.00 pm, Seminar Hall
Some homology calculations using discrete Morse theory(Abstract)
Naageswaran M.
Chennai Mathematical Institute.

160419
MSc (Mathematics) thesis defence talks
11.50 am, Seminar Hall
Forcing and Measurable subsets of R(Abstract)
Raein Banerjee
Chennai Mathematical Institute.

150419
MSc (Mathematics) thesis defence talks
2.00 am, Seminar Hall
GIT and the classification of Semistable Vector Bundles over a Curve(Abstract)
V. Sridhar
Chennai Mathematical Institute.

150419
MSc (Mathematics) thesis defence talks
3:30 pm, Seminar Hall
On the Non vanishing of Dirichlet L functions using twisted molifier(Abstract)
Arghya Datta
Chennai Mathematical Institute.

120419
MSc (Mathematics) thesis defence talks
11:50 am, Seminar Hall
Finite Dimensional Inclusion and Path Algebra(Abstract)
Utsabraj Sarkar
Chennai Mathematical Institute.

110419
2.00 pm, Lecture Hall 803
Conformal Properties of SoftOperators
Partha Paul
IOP Bhubaneshwar.

110419
RESEARCH METHODOLOGY SEMINAR
11:45 am  12:45 pm, Lecture Hall 1
On the Ring of Invariants of Finite Groups generated by pseudoreflections(Abstract)
Shubham Ovhal
Chennai Mathematical Institute.

100419
3:30 pm, Seminar Hall
A study of KostantKumar modules via Littelmann paths(Abstract)
K.N. Raghavan
Institute of Mathematical Sciences, Chennai.

100419
2.00 pm, Seminar Hall
AverageCase FineGrained Hardness, and what to do with it(Abstract)
Prashant Nalini Vasudevan
Univ. of California Berkeley.

100419
2.00 pm, Lecture Hall 803
KdVtype nonlinear dispersive regularization of gas dynamics(Abstract)
Sonakshi Sachdev
Chennai Mathematical Institute.

100419
RESEARCH METHODOLOGY SEMINAR
11:45 am  12:45 pm, Lecture Hall 5
Riemann Roch theorem for nonsingular curves(Abstract)
Aishik Chattopadhyay
Chennai Mathematical Institute.

100419
RESEARCH METHODOLOGY SEMINAR
10:30 am  11:30 am, Lecture Hall 5
Cartan Hadamard Theorem & Synge’s Theorem(Abstract)
Pritthijit Biswas
Chennai Mathematical Institute.

090419
2.00 pm, Lecture Hall 802
Chaotic Correlation Functions with Complex Fermions(Abstract)
Ritabrata Bhattacharya
HRI Allahabad.

040419
3:30 pm, Seminar Hall
Making sense of Opinion polls(Abstract)
Rajeeva L. Karandikar
Chennai Mathematical Institute.

040419
2.00 pm, Lecture Hall 803
UnruhDeWitt detector in presence of multiple scalar fields : A Toy Model(Abstract)
Ashmita Das
IIT Guwahati.

290319
10:45  11:45 am, Seminar Hall
Parameterized Verification of Coverability in Infinite State Broadcast Networks(Abstract)
Balasubramanian A.R.
Chennai Mathematical Institute.

280319
2.00 pm, Lecture Hall 802
Connection between double copy structures in quantum and classical theories(Abstract)
A. Manu
Chennai Mathematical Institute.

270319
2.00 pm, Lecture Hall 803
Timedependent NAdS2 holography with applications(Abstract)
Alexander Soloviev
University of Vienna.

200319
3:30 pm, Seminar Hall
Commuting conjugates of finiteorder mapping classes(Abstract)
Kashyap Rajeevsarathy
IISER, Bhopal.

200319
2.00 pm, Lecture Hall 6
On the Hamiltonian formulation and integrability of the RajeevRanken model(Abstract)
T.R. Vishnu
Chennai Mathematical Institute.

190319
3:30 pm, Seminar Hall
Introduction to Mapping Class Groups(Abstract)
Kashyap Rajeevsarathy
IISER, Bhopal.

190319
2.00 pm, Seminar Hall
Computation of the characteristic polynomial of certain threshold arrangements(Abstract)
Balasubramanian A.R.
Chennai Mathematical Institute.

190319
2.00 pm, Lecture Hall 802
BTZ dynamics and chaos(Abstract)
Rohan Poojary
Chennai Mathematical Institute.

180319
3:30 pm, Seminar Hall
Introduction to Mapping Class Groups(Abstract)
Kashyap Rajeevsarathy
IISER, Bhopal.

180319
2.00 pm, Lecture Hall 801
Scattering Amplitudes from Geometry of Polytopes
Alok Laddha
Chennai Mathematical Institute.

150319
10:30, Seminar Hall
On the computation of multilinear polynomials A walkthrough Algebraic Complexity Theory and Beyond(Abstract)
C Ramya
Chennai Mathematical Institute.

120319
2.00 pm, Lecture Hall 802
Towards Singlet Spectrum in SYKlike Tensor Models(Abstract)
K.V. Pavan Kumar
IISc Bangalore.

110319
2.00 pm, Lecture Hall 801
Extremal surfaces, de Sitter entropy and entanglement in ghost systems(Abstract)
K Narayan
Chennai Mathematical Institute.

060319
2.00 pm, Lecture Hall 5
Conserved charges in asymptotically deSitter spacetimes(Abstract)
P.B. Aneesh
Chennai Mathematical Institute.

280219
3:30 PM  4:30 PM, LH 5
Optimal Stopping: Prophets and Secretaries(Abstract)
Ashish Chiplunkar
EPFL Lausanne.

280219
LECTURE SERIES ANNOUNCEMENT
2.00 pm & 3:30 pm, Seminar Hall
Hyperplane sections of K3 surfaces and Bridgeland stability(Abstract)
Enrico Arbarello
Universita di Roma "La Sapienza.

210219
LECTURE SERIES ANNOUNCEMENT  every Tuesday and Thursday till early March
3:30 pm, Seminar Hall
Hyperplane sections of K3 surfaces and Bridgeland stability(Abstract)
Enrico Arbarello
Universita di Roma "La Sapienza.

200219
3.30pm, Seminar Hall
Some Lagrangian fibrations in algebraic geometry(Abstract)
Enrico Arbarello
Universita di Roma "La Sapienza", Italy.

200219
LECTURE COURSE ANNOUNCEMENT
30/01/19, 06/02/19, 13/02/19, 20/02/19 (Wednesdays); 3.15 pm; Lecture Hall 6
An introduction to string perturbation theory(Abstract)
Subhroneel Chakrabarti
Institute of Mathematical Sciences, Chennai.

190219
2:00 pm, Seminar Hall
CMI Arts Initiative Lecture(Abstract)
Mindy Gill and Jeet Thayil
Writers in residence at Chennai Mathematical Institute.

130219
3:30 pm, Seminar Hall
Reductive groups over arithmetic surfaces and localglobal principles(Abstract)
Parimala Raman
Emory University.

130219
2:00 pm, Seminar Hall
CMI Arts Initiative Lecture(Abstract)
Francesca Marciano
writer in residence at Chennai Mathematical Institute.

130219
2.00 pm, Lecture Hall 5
A method to test the binary black hole nature of the compact binary coalescence(Abstract)
N.V. Krishnendu
Chennai Mathematical Institute.

120219
3.00 pm, Lecture Hall 6
Classical and Quantum Results on logarithmic terms in Soft Graviton theorem
Biswajit Sahoo
HRI.

110219
3:30 pm, Seminar Hall
Two unsolved problems: Birkhoff–von Neumann graphs and PMcompact graphs(Abstract)
Nishad Kothari
Institute of Computing University of Campinas (UNICAMP), Brazil.

080219
R.K. Rubugunday Distinguished Lecture
2.00 pm, Seminar Hall
R.P. Stanley’s solution of AnandDumirGupta Conjectures about Magic Squares(Abstract)
J.K. Verma
Indian Institute of Technology, Bombay.

080219
12:00, Seminar Hall
Efficient Dimensionality Reduction for Sparse Binary Data(Abstract)
Rameshwar Pratap
Wipro AIResearch.

080219
10:30 am, Lecture Hall 5
VeryWell Structured Transition Systems(Abstract)
Alain Finkel
LSV, CNRS & ENS ParisSaclay.

070219
2.00 pm, Lecture Hall 803
Allowed region and uncertainty relations for angular momentum observables(Abstract)
Arun Sehrawat
HRI.

060219
3:30 pm, Lecture Hall 803
What is thinking in mathematics and computer science ?(Abstract)
Alain Finkel
LSV, CNRS & ENS ParisSaclay.

060219
3:30 pm, Seminar Hall
Embeddings of contact and symplectic manifolds(Abstract)
Dishant Pancholi
Institute of Mathematical Sciences, Chennai.

010219
11.30 am, Lecture Hall 6
Asymptotic symmetries and soft theorems
Miguel Campiglia
University of Montevideo, Uruguay.

300119
3:30 pm, Seminar Hall
Quadrature domains in higher dimensions(Abstract)
Pranav Haridas
Chennai Mathematical Institute.

300119
2.00 pm, Lecture Hall 5
Periodic orbits and stability in the classical threerotor problem(Abstract)
Himalaya Senapati
Chennai Mathematical Institute.

250119
3.30 pm, Lecture Hall 6
A generalised Korovkin’s Theorem(Abstract)
Pradipta Bandyopadhyay
Indian Statistical Institute, Kolkata.

250119
2:00 pm, Seminar Hall
Polynomial equivalence over rings(Abstract)
Ramarathnam Venkatesan
Cloud + AI, Microsoft.

230119
3.30 pm, Lecture Hall 6
Classification of regular subalgebras of affine Lie algebras(Abstract)
R. Venkatesh
IISc Bangalore.

220119
2.00 pm, Lecture Hall 5
Edge modes in Quantum Gravity and Gauge theory
Marc Geiller
ENS, Lyon.

180119
10:3011:45, Seminar Hall
A 2Approximation Algorithm for Weighted Feedback Vertex Set in Tournaments(Abstract)
Geevarghese Philip
Chennai Mathematical Institute.

170119
2.00 pm, Seminar Hall
On representation theory of partition algebras for complex reflection groups(Abstract)
Ashish Mishra
Visiting professor, Universidade Federal do Para.

160119
3.30 p.m., Seminar Hall
Higgs bundles and higher Teichmueller spaces(Abstract)
Oscar GarciaPrada
ICMAT, Madrid.

160119
2:00 pm, Seminar Hall
Algebraic cycles and the rationality problem(Abstract)
Kalyan Banerjee
HRI.

160119
9:30 am, Seminar Hall
Modeling Distributed Algorithms by Local Computations with Applications(Abstract)
Mohamed Mosbah
LaBRI, University of Bordeaux.

140119
12:00 noon, Seminar Hall
Foundations for Natural Proofs and Quantifier Instantiation(Abstract)
Madhusudan Parthasarathy
University of Illinois at UrbanaChampaign.

110119
3.30 pm, Lecture Hall 6
Hecke operators and the coherent cohomology of Shimura varieties(Abstract)
Najmuddin Fakhruddin
TIFR.

110119
10:45 am, Seminar Hall
The Lovász Vector of a Graph, with Applications to Isomorphism Testing(Abstract)
Gaurav Rattan
RWTH Aachen, Germany.

090119
3.30 pm, Lecture Hall 6
Soldering freedom and BMS like transformations(Abstract)
Srijit Bhattacharjee
IIIT Allahabad.

090119
3.30 pm, Seminar Hall
The minimal model program and the work of Caucher Birkar(Abstract)
Najmuddin Fakhruddin
TIFR.

090119
12:00 noon, Seminar Hall
Code Variants and Their Retrieval(Abstract)
Venkatesh Vinayakarao
IIIT Sri City.

040119
10:3011:45, Seminar Hall
The Parameterized Complexity of Network Design Problems(Abstract)
Pranabendu Misra
University of Bergen.

030119
3:30 pm, Seminar Hall
GromovWitten Theory and Virtual Fundamental Classes(Abstract)
Mohan Swaminathan
Princeton University.
