Chennai Mathematical Institute

Seminars




Today's Seminar
  • 25-04-19
    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 self-contained, 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 exponentially-many 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 sub-linearly 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 spike-train to spike-train 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
  • 26-04-19
    2.00 pm, Lecture Hall 802
    Coherent States in QCD(Abstract)
    P.V. Athira
    Chennai Mathematical Institute.

Past Seminars (this year)
  • 23-04-19
    3.45 pm - 4.30 pm, Lecture Hall 1
    An Introduction to Bounded Height Conjecture(Abstract)
    Aritriya Mukhapadhyay
    Chennai Mathematical Institute.

  • 23-04-19
    3.00 pm - 3.45 pm, Lecture Hall 1
    On Manin Mumford Conjecture(Abstract)
    Aritriya Mukhapadhyay
    Chennai Mathematical Institute.

  • 17-04-19
    3.30 pm, Seminar Hall
    PolyMath14: Groups with norms(Abstract)
    Apoorva Khare
    Indian Institute of Science, Bangalore.

  • 17-04-19
    MSc (Mathematics) thesis defence talks
    2.00 pm, Seminar Hall
    Moduli space of spatial polygons(Abstract)
    Sambit Senapati
    Chennai Mathematical Institute.

  • 17-04-19
    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.

  • 17-04-19
    MSc (Mathematics) thesis defence talks
    11.50 am, Seminar Hall
    J-holomorphic curves and Gromov's nonsqueezing theorem(Abstract)
    Paramjit Singh
    Chennai Mathematical Institute.

  • 16-04-19
    MSc (Mathematics) thesis defence talks
    2.00 pm, Seminar Hall
    Some homology calculations using discrete Morse theory(Abstract)
    Naageswaran M.
    Chennai Mathematical Institute.

  • 16-04-19
    MSc (Mathematics) thesis defence talks
    11.50 am, Seminar Hall
    Forcing and Measurable subsets of R(Abstract)
    Raein Banerjee
    Chennai Mathematical Institute.

  • 15-04-19
    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.

  • 15-04-19
    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.

  • 12-04-19
    MSc (Mathematics) thesis defence talks
    11:50 am, Seminar Hall
    Finite Dimensional Inclusion and Path Algebra(Abstract)
    Utsabraj Sarkar
    Chennai Mathematical Institute.

  • 11-04-19
    2.00 pm, Lecture Hall 803
    Conformal Properties of Soft-Operators
    Partha Paul
    IOP Bhubaneshwar.

  • 11-04-19
    RESEARCH METHODOLOGY SEMINAR
    11:45 am - 12:45 pm, Lecture Hall 1
    On the Ring of Invariants of Finite Groups generated by pseudo-reflections(Abstract)
    Shubham Ovhal
    Chennai Mathematical Institute.

  • 10-04-19
    3:30 pm, Seminar Hall
    A study of Kostant-Kumar modules via Littelmann paths(Abstract)
    K.N. Raghavan
    Institute of Mathematical Sciences, Chennai.

  • 10-04-19
    2.00 pm, Seminar Hall
    Average-Case Fine-Grained Hardness, and what to do with it(Abstract)
    Prashant Nalini Vasudevan
    Univ. of California Berkeley.

  • 10-04-19
    2.00 pm, Lecture Hall 803
    KdV-type nonlinear dispersive regularization of gas dynamics(Abstract)
    Sonakshi Sachdev
    Chennai Mathematical Institute.

  • 10-04-19
    RESEARCH METHODOLOGY SEMINAR
    11:45 am - 12:45 pm, Lecture Hall 5
    Riemann Roch theorem for nonsingular curves(Abstract)
    Aishik Chattopadhyay
    Chennai Mathematical Institute.

  • 10-04-19
    RESEARCH METHODOLOGY SEMINAR
    10:30 am - 11:30 am, Lecture Hall 5
    Cartan Hadamard Theorem & Synge’s Theorem(Abstract)
    Pritthijit Biswas
    Chennai Mathematical Institute.

  • 09-04-19
    2.00 pm, Lecture Hall 802
    Chaotic Correlation Functions with Complex Fermions(Abstract)
    Ritabrata Bhattacharya
    HRI Allahabad.

  • 04-04-19
    3:30 pm, Seminar Hall
    Making sense of Opinion polls(Abstract)
    Rajeeva L. Karandikar
    Chennai Mathematical Institute.

  • 04-04-19
    2.00 pm, Lecture Hall 803
    Unruh-DeWitt detector in presence of multiple scalar fields : A Toy Model(Abstract)
    Ashmita Das
    IIT Guwahati.

  • 29-03-19
    10:45 - 11:45 am, Seminar Hall
    Parameterized Verification of Coverability in Infinite State Broadcast Networks(Abstract)
    Balasubramanian A.R.
    Chennai Mathematical Institute.

  • 28-03-19
    2.00 pm, Lecture Hall 802
    Connection between double copy structures in quantum and classical theories(Abstract)
    A. Manu
    Chennai Mathematical Institute.

  • 27-03-19
    2.00 pm, Lecture Hall 803
    Time-dependent NAdS2 holography with applications(Abstract)
    Alexander Soloviev
    University of Vienna.

  • 20-03-19
    3:30 pm, Seminar Hall
    Commuting conjugates of finite-order mapping classes(Abstract)
    Kashyap Rajeevsarathy
    IISER, Bhopal.

  • 20-03-19
    2.00 pm, Lecture Hall 6
    On the Hamiltonian formulation and integrability of the Rajeev-Ranken model(Abstract)
    T.R. Vishnu
    Chennai Mathematical Institute.

  • 19-03-19
    3:30 pm, Seminar Hall
    Introduction to Mapping Class Groups(Abstract)
    Kashyap Rajeevsarathy
    IISER, Bhopal.

  • 19-03-19
    2.00 pm, Seminar Hall
    Computation of the characteristic polynomial of certain threshold arrangements(Abstract)
    Balasubramanian A.R.
    Chennai Mathematical Institute.

  • 19-03-19
    2.00 pm, Lecture Hall 802
    BTZ dynamics and chaos(Abstract)
    Rohan Poojary
    Chennai Mathematical Institute.

  • 18-03-19
    3:30 pm, Seminar Hall
    Introduction to Mapping Class Groups(Abstract)
    Kashyap Rajeevsarathy
    IISER, Bhopal.

  • 18-03-19
    2.00 pm, Lecture Hall 801
    Scattering Amplitudes from Geometry of Polytopes
    Alok Laddha
    Chennai Mathematical Institute.

  • 15-03-19
    10:30, Seminar Hall
    On the computation of multilinear polynomials ---A walk-through Algebraic Complexity Theory and Beyond(Abstract)
    C Ramya
    Chennai Mathematical Institute.

  • 12-03-19
    2.00 pm, Lecture Hall 802
    Towards Singlet Spectrum in SYK-like Tensor Models(Abstract)
    K.V. Pavan Kumar
    IISc Bangalore.

  • 11-03-19
    2.00 pm, Lecture Hall 801
    Extremal surfaces, de Sitter entropy and entanglement in ghost systems(Abstract)
    K Narayan
    Chennai Mathematical Institute.

  • 06-03-19
    2.00 pm, Lecture Hall 5
    Conserved charges in asymptotically deSitter spacetimes(Abstract)
    P.B. Aneesh
    Chennai Mathematical Institute.

  • 28-02-19
    3:30 PM - 4:30 PM, LH 5
    Optimal Stopping: Prophets and Secretaries(Abstract)
    Ashish Chiplunkar
    EPFL Lausanne.

  • 28-02-19
    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.

  • 21-02-19
    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.

  • 20-02-19
    3.30pm, Seminar Hall
    Some Lagrangian fibrations in algebraic geometry(Abstract)
    Enrico Arbarello
    Universita di Roma "La Sapienza", Italy.

  • 20-02-19
    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.

  • 19-02-19
    2:00 pm, Seminar Hall
    CMI Arts Initiative Lecture(Abstract)
    Mindy Gill and Jeet Thayil
    Writers in residence at Chennai Mathematical Institute.

  • 13-02-19
    3:30 pm, Seminar Hall
    Reductive groups over arithmetic surfaces and local-global principles(Abstract)
    Parimala Raman
    Emory University.

  • 13-02-19
    2:00 pm, Seminar Hall
    CMI Arts Initiative Lecture(Abstract)
    Francesca Marciano
    writer in residence at Chennai Mathematical Institute.

  • 13-02-19
    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.

  • 12-02-19
    3.00 pm, Lecture Hall 6
    Classical and Quantum Results on logarithmic terms in Soft Graviton theorem
    Biswajit Sahoo
    HRI.

  • 11-02-19
    3:30 pm, Seminar Hall
    Two unsolved problems: Birkhoff–von Neumann graphs and PM-compact graphs(Abstract)
    Nishad Kothari
    Institute of Computing University of Campinas (UNICAMP), Brazil.

  • 08-02-19
    R.K. Rubugunday Distinguished Lecture
    2.00 pm, Seminar Hall
    R.P. Stanley’s solution of Anand-Dumir-Gupta Conjectures about Magic Squares(Abstract)
    J.K. Verma
    Indian Institute of Technology, Bombay.

  • 08-02-19
    12:00, Seminar Hall
    Efficient Dimensionality Reduction for Sparse Binary Data(Abstract)
    Rameshwar Pratap
    Wipro AI-Research.

  • 08-02-19
    10:30 am, Lecture Hall 5
    Very-Well Structured Transition Systems(Abstract)
    Alain Finkel
    LSV, CNRS & ENS Paris-Saclay.

  • 07-02-19
    2.00 pm, Lecture Hall 803
    Allowed region and uncertainty relations for angular momentum observables(Abstract)
    Arun Sehrawat
    HRI.

  • 06-02-19
    3:30 pm, Lecture Hall 803
    What is thinking in mathematics and computer science ?(Abstract)
    Alain Finkel
    LSV, CNRS & ENS Paris-Saclay.

  • 06-02-19
    3:30 pm, Seminar Hall
    Embeddings of contact and symplectic manifolds(Abstract)
    Dishant Pancholi
    Institute of Mathematical Sciences, Chennai.

  • 01-02-19
    11.30 am, Lecture Hall 6
    Asymptotic symmetries and soft theorems
    Miguel Campiglia
    University of Montevideo, Uruguay.

  • 30-01-19
    3:30 pm, Seminar Hall
    Quadrature domains in higher dimensions(Abstract)
    Pranav Haridas
    Chennai Mathematical Institute.

  • 30-01-19
    2.00 pm, Lecture Hall 5
    Periodic orbits and stability in the classical three-rotor problem(Abstract)
    Himalaya Senapati
    Chennai Mathematical Institute.

  • 25-01-19
    3.30 pm, Lecture Hall 6
    A generalised Korovkin’s Theorem(Abstract)
    Pradipta Bandyopadhyay
    Indian Statistical Institute, Kolkata.

  • 25-01-19
    2:00 pm, Seminar Hall
    Polynomial equivalence over rings(Abstract)
    Ramarathnam Venkatesan
    Cloud + AI, Microsoft.

  • 23-01-19
    3.30 pm, Lecture Hall 6
    Classification of regular subalgebras of affine Lie algebras(Abstract)
    R. Venkatesh
    IISc Bangalore.

  • 22-01-19
    2.00 pm, Lecture Hall 5
    Edge modes in Quantum Gravity and Gauge theory
    Marc Geiller
    ENS, Lyon.

  • 18-01-19
    10:30--11:45, Seminar Hall
    A 2-Approximation Algorithm for Weighted Feedback Vertex Set in Tournaments(Abstract)
    Geevarghese Philip
    Chennai Mathematical Institute.

  • 17-01-19
    2.00 pm, Seminar Hall
    On representation theory of partition algebras for complex reflection groups(Abstract)
    Ashish Mishra
    Visiting professor, Universidade Federal do Para.

  • 16-01-19
    3.30 p.m., Seminar Hall
    Higgs bundles and higher Teichmueller spaces(Abstract)
    Oscar Garcia-Prada
    ICMAT, Madrid.

  • 16-01-19
    2:00 pm, Seminar Hall
    Algebraic cycles and the rationality problem(Abstract)
    Kalyan Banerjee
    HRI.

  • 16-01-19
    9:30 am, Seminar Hall
    Modeling Distributed Algorithms by Local Computations with Applications(Abstract)
    Mohamed Mosbah
    LaBRI, University of Bordeaux.

  • 14-01-19
    12:00 noon, Seminar Hall
    Foundations for Natural Proofs and Quantifier Instantiation(Abstract)
    Madhusudan Parthasarathy
    University of Illinois at Urbana-Champaign.

  • 11-01-19
    3.30 pm, Lecture Hall 6
    Hecke operators and the coherent cohomology of Shimura varieties(Abstract)
    Najmuddin Fakhruddin
    TIFR.

  • 11-01-19
    10:45 am, Seminar Hall
    The Lovász Vector of a Graph, with Applications to Isomorphism Testing(Abstract)
    Gaurav Rattan
    RWTH Aachen, Germany.

  • 09-01-19
    3.30 pm, Lecture Hall 6
    Soldering freedom and BMS like transformations(Abstract)
    Srijit Bhattacharjee
    IIIT Allahabad.

  • 09-01-19
    3.30 pm, Seminar Hall
    The minimal model program and the work of Caucher Birkar(Abstract)
    Najmuddin Fakhruddin
    TIFR.

  • 09-01-19
    12:00 noon, Seminar Hall
    Code Variants and Their Retrieval(Abstract)
    Venkatesh Vinayakarao
    IIIT Sri City.

  • 04-01-19
    10:30--11:45, Seminar Hall
    The Parameterized Complexity of Network Design Problems(Abstract)
    Pranabendu Misra
    University of Bergen.

  • 03-01-19
    3:30 pm, Seminar Hall
    Gromov-Witten Theory and Virtual Fundamental Classes(Abstract)
    Mohan Swaminathan
    Princeton University.