Chennai Mathematical Institute

Seminars




Today's Seminar
  • 25-07-17
    3:00 pm, Seminar Hall
    Extremal varieties of general type in all dimensions (with Jungkai Chen and Francisco Gallego)
    Purnaprajna P. Bangere
    University of Kansas.
    Abstract
    What is the analogue of genus 2 curves in higher dimensions? This talk answers this basic question among many other things. We consider the relations among fundamental invariants that play an important role in algebraic geometry. In particular, the relations between canonical volume and geometric genus for varieties of general type are established. We prove an inequality for a $n$-dimensional minimal Gorenstein variety of general type and investigate the compelling extremal case, when the inequality is an equality. These extremal varieties are natural higher dimensional analogue of Horikawa's surfaces whose invariants satisfy the equality in Noether's inequality. For extremal varieties of general type of arbitrary dimension, it is shown that their canonical linear system are base point free. We give a characterization of these varieties and study its deformation type. It is also proved that these extremal varieties of general type are simply connected, and are pluri-regular (in the smooth case). Optimal results on projective normality of pluri-canonical linear systems are also proved. These results and those not mentioned here but will be dealt in the talk, give a complete generalization of Horikawa's results in Annals of Math (1976) for all dimensions!


Forthcoming Seminars
  • 21-08-17
    2:00 pm to 3:15 pm, Lecture Hall 1
    Single cohomology classes in your area - this last weird trick will shock you!(Abstract)
    Ronno Das
    University of Chicago.

  • 23-08-17
    3:30 pm - 4:30, Seminar Hall
    Simplicial resolution a la Vassiliev and counting points(Abstract)
    Ronno Das
    University of Chicago.

Past Seminars (this year)
  • 12-07-17
    3:30 pm, Seminar Hall
    On the density of polynomials having squarefree discriminants(Abstract)
    Arul Shankar
    University of Toronto.

  • 12-07-17
    PUBLIC VIVA-VOCE NOTIFICATION (COMPUTER SCIENCE)
    11.30 am, Seminar Hall
    Finding Transitive Subgraphs and Counting Popular Matchings(Abstract)
    Nitesh Jha
    Chennai Mathematical Institute.

  • 07-07-17
    11.30 am, Seminar Hall
    Using Supersymmetry to create Many Body Localized Phases(Abstract)
    Pramod Padmanabhan
    Institute for Basic Science, South Korea.

  • 06-07-17
    3.30 pm, Seminar Hall
    Schur-Weyl duality and a new tensor product for representations of the general linear group
    Joint work with Shraddha Srivastava and K.V. Subrahamanyam(Abstract)
    Upendra Kulkarni
    Chennai Mathematical Institute.

  • 05-07-17
    3:30-4:45pm, Seminar Hall
    Deformation of Canonical morphisms and Moduli spaces (with F. J. Gallego and M. Gonzalez)(Abstract)
    Purnaprajna P. Bangere
    University of Kansas.

  • 03-07-17
    3:30-4:45pm, CMI Auditorium
    Geometry in Music(Abstract)
    Purnaprajna P. Bangere
    University of Kansas.

  • 30-06-17
    2:00 pm, Lecture Hall 3
    New class of convex sets in semidefinite programming and their characterizations(Abstract)
    Anusuya Ghosh
    IIM Bangalore.

  • 21-06-17
    3.30pm,Lecture Hall 2
    Moduli spaces of polygons and moduli spaces of labelled points: the real story(Abstract)
    Priyavrat Deshpande
    Chennai Mathematical Institute.

  • 15-06-17
    11.45am,Lecture Hall 4
    M.Sc Thesis Defence
    Bispectrum invariants for learning images(Abstract)
    Neha Sangwan
    Chennai Mathematical Institute.

  • 14-06-17
    11.00 am, Lecture Hall 804
    M.Sc Thesis Defence
    Monodromy of fibred knots(Abstract)
    Diptaishik Choudhury
    Chennai Mathematical Institute.

  • 13-06-17
    3:30pm-4:30 pm, Lecture Hall 4
    Ethnic conflicts and human rights violations: A complex network analysis(Abstract)
    Kiran Sharma
    JNU.

  • 08-06-17
    3:30pm-4:30pm, Seminar Hall
    Financial fluctuations and economic fundamentals: A network approach(Abstract)
    Anirban Chakraborti
    JNU.

  • 06-06-17
    11.00 am, Lecture Hall 1
    M.Sc Thesis Defence
    A Survey of Alternation-Trading Proofs for Time-Space Lower Bounds(Abstract)
    Kumar Shubham
    Chennai Mathematical Institute.

  • 24-05-17
    3:30.pm, Lecture Hall 1
    Conormal Varieties on the Cominuscule Grassmannian(Abstract)
    Rahul Singh
    Northeastern University, USA.

  • 22-05-17
    3:30 pm, Lecture Hall 3
    On a conjecture of Livingston(Abstract)
    Siddhi Pathak
    Queens University, Canada.

  • 22-05-17
    2:15 pm, Lecture Hall 3
    On the generalized Brauer-Siegel Theorem(Abstract)
    Anup Dixit
    University of Toronto.

  • 17-05-17
    2.00 pm, Lecture Hall 3
    M.Sc. Thesis Defence
    Graph automata and tree-width(Abstract)
    Adwitee Roy
    Chennai Mathematical Institute.

  • 11-05-17
    1:45, Lecture Hall 2
    Grothendieck Duality, the abstract approach(Abstract)
    Pramathanath Sastry
    Chennai Mathematical Institute.

  • 05-05-17
    3.30 pm, Lecture Hall 2
    The Chasm at Depth Four, and Tensor Rank : Old results, new insights(Abstract)
    Suryajith Chillara
    Chennai Mathematical Institute.

  • 28-04-17
    2:00PM, Lecture Hall 1
    M.Sc Thesis Defence
    Concurrent Program Verification Using Invariants-guided Under-approximations: A Method and Tool(Abstract)
    Sumanth Prabhu
    Chennai Mathematical Institute.

  • 28-04-17
    11:00 am, Lecture Hall 1
    M.Sc Thesis Defence
    FPT Algorithms using Algebraic Techniques(Abstract)
    Prantar Ghosh
    Chennai Mathematical Institute.

  • 27-04-17
    3:30 PM, Lecture Hall 1
    M.Sc Thesis Defence
    Reversible regular languages and \star-semigroups(Abstract)
    Govind R.
    Chennai Mathematical Institute.

  • 26-04-17
    2:00 pm, Lecture Hall 1
    M.Sc Thesis Defence
    Stability of two social network models(Abstract)
    Aditya Aradhye
    Chennai Mathematical Institute.

  • 24-04-17
    11.30 am, Lecture Hall 1
    M.Sc Thesis Defence
    K theory through quasi homomorphisms(Abstract)
    Prakash Kumar Singh
    Chennai Mathematical Institute.

  • 21-04-17
    3.30 pm, Seminar Hall
    MSc thesis defence
    Discrete Morse theory on moduli spaces of planar polygons(Abstract)
    Nachiketa Adhikari
    Chennai Mathematical Institute.

  • 20-04-17
    2.30 pm, Seminar Hall
    MSc. Thesis Defence
    Multi-point Seshadri Constants on Surfaces(Abstract)
    Alapan Mukhopadhyay
    Chennai Mathematical Institute.

  • 19-04-17
    14:00 - 15:00 Hours
    Colloquium followed by Musical Concert in Honour of Prof J. V. Deshpande
    Variable selection using Kullback-Leibler divergence loss(Abstract)
    Shibasish Dasgupta
    Ford Motors.

  • 13-04-17
    2.00 pm, Seminar Hall
    A gravity dual to the Sachdev-Ye-Kitaev model at low energies
    Spenta Wadia
    ICTS-TIFR Bangalore.

  • 12-04-17
    3.30 p.m., Seminar Hall
    Dr. P. Sheel Memorial Medal Lecture of the National Academy of Sciences, Allahabad
    Elliptic curves and Poisson distribution(Abstract)
    R. Balasubramanian
    Institute of Mathematical Sciences, Chennai., Chennai.

  • 12-04-17
    2.00 pm, Seminar Hall
    Holography and Black Holes(Abstract)
    Spenta Wadia
    ICTS-TIFR Bangalore.

  • 10-04-17
    10:30 AM, Seminar Hall
    M.Sc. Thesis Defence
    Kahler-Ricci flow
    Akashdeep Dey
    Chennai Mathematical Institute.

  • 03-04-17
    14:00 to 14:45, Seminar Hall
    Existential Assertions for Voting Protocols(Abstract)
    Vaishnavi Sundararajan
    Chennai Mathematical Institute.

  • 29-03-17
    3:30 pm, Seminar Hall
    A noncommutative Matlis-Greenlees-May equivalence(Abstract)
    Rishi Vyas
    Ben Gurion University.

  • 23-03-17
    3:30 pm, Lecture Hall 5
    Dualizing Complexes in the Noncommutative Arithmetic Context(Abstract)
    Rishi Vyas
    Ben Gurion University.

  • 20-03-17
    3:30 pm, Seminar Hall
    Counting zeroes of Laurent polynomials in the algebraic torus(Abstract)
    Jugal Verma
    IIT-Bombay.

  • 17-03-17
    3.30 pm, Lecture Hall 803
    Maths MSc/PhD Research Seminar on March 13,15,16,17
    Absolute Integral Closure In Positive Characteristic
    Dharm Veer
    Chennai Mathematical Institute.

  • 17-03-17
    2.00 pm, Lecture Hall 803
    Maths MSc/PhD Research Seminar on March 13,15,16,17
    On the Structure and Ideal Theory of Complete Local Rings by I.S.Cohen
    Aditya N.K Subramaniam
    Chennai Mathematical Institute.

  • 16-03-17
    1.30 pm, Seminar Hall
    Maths MSc/PhD Research Seminar on March 13,15,16,17
    Discrete Product Systems And their C* algebras(Abstract)
    Debdyuti Banerjee
    Chennai Mathematical Institute.

  • 15-03-17
    3.30 pm, Lecture Hall 803
    Maths MSc/PhD Research Seminar on March 13,15,16,17
    Title TBA
    Kushal Banerjee
    Chennai Mathematical Institute.

  • 15-03-17
    3:30 pm, Seminar Hall
    Goldman bracket: center and geometric intersection number(Abstract)
    Arpan Kabiraj
    Chennai Mathematical Institute.

  • 13-03-17
    2.00 pm, Seminar Hall
    Maths MSc/PhD Research Seminar on March 13,15,16,17(Abstract)
    Navnath
    Chennai Mathematical Institute.

  • 09-03-17
    3:30 pm, Seminar Hall
    Andaman & Nicobar Islands(Abstract)
    Pankaj Sekhsaria
    DST-Centre for Policy Research, Dept of Humanities and Social Science, IIT-Delhi.

  • 08-03-17
    3:30-4:45 pm, Seminar Hall
    Quotients of smooth affine 3-folds modulo the additive group G_a of complex numbers(Abstract)
    R.V. Gurjar
    IIT-Bombay.

  • 08-03-17
    2.00 pm, Seminar Hall
    An algorithm to compute the nucleolus of binary assignment games(Abstract)
    T.E.S. Raghavan
    University of Illinois at Chicago.

  • 07-03-17
    3:30-4:45 pm, Lecture Hall 5
    Lectures on Rational Singularities(Abstract)
    R.V. Gurjar
    IIT-Bombay.

  • 06-03-17
    3:30-4:45 pm, Lecture Hall 5
    Lectures on Rational Singularities(Abstract)
    R.V. Gurjar
    IIT-Bombay.

  • 03-03-17
    3.30 pm, Lecture Hall 1
    Reductions between one-clock time automata & lossy channel systems (Part II)(Abstract)
    P. Schnoebelen
    CNRS, ENS Cachan and Infosys Professor, Chennai Mathematical Institute.

  • 03-03-17
    2:00 pm, Lecture Hall 3
    Splitting subspaces of linear transformations over finite fields(Abstract)
    Samrith Ram
    HRI, Allahabad.

  • 02-03-17
    3:30-4:45 pm, Lecture Hall 5
    Lectures on Rational Singularities(Abstract)
    R.V. Gurjar
    IIT-Bombay.

  • 01-03-17
    3:30-4:45 pm, Lecture Hall 5
    Lectures on Rational Singularities(Abstract)
    R.V. Gurjar
    IIT-Bombay.

  • 28-02-17
    3:30-4:45 pm, Lecture Hall 5
    Lectures on Rational Singularities(Abstract)
    R.V. Gurjar
    IIT-Bombay.

  • 28-02-17
    10:30-13:00, Lecture Hall 4
    Introduction to formal schemes and formal duality
    Pramathanath Sastry
    Chennai Mathematical Institute.

  • 24-02-17
    3.30 pm, Seminar Hall
    Reductions between one-clock time automata & lossy channel systems(Abstract)
    P. Schnoebelen
    CNRS, ENS Cachan and Infosys Professor, Chennai Mathematical Institute.

  • 24-02-17
    2.00 pm, Lecture Hall 1
    Of Legendrian Knots and First Order Theorem Provers(Abstract)
    TVH Prathamesh
    Postdoctoral Fellow at Institute of Mathematical Sciences, Chennai.

  • 22-02-17
    3:30 pm, Seminar Hall
    Levi subgroup actions on Schubert varieties, induced decompositions of their coordinate rings, sphericity and singularity consequences(Abstract)
    V. Lakshmibai
    Northeastern University, Boston, U.S.A.

  • 21-02-17
    3.30 pm, Lecture Hall 1
    A Short Course on Algorithmic Program Verification(Abstract)
    Ahmed Bouajjani
    IRIF, Univ. of Paris-Diderot, France.

  • 21-02-17
    10:30-13:00, Lecture Hall 1
    Theorem of formal functions and formal duality
    Pramathanath Sastry
    Chennai Mathematical Institute.

  • 16-02-17
    3.30 pm, Seminar Hall
    A Short Course on Algorithmic Program Verification(Abstract)
    Ahmed Bouajjani
    IRIF, Univ. of Paris-Diderot, France.

  • 16-02-17
    10:30 am., Seminar Hall
    Algorithmic and optimization aspects of Brascamp-Lieb inequalities(Abstract)
    Ankit Garg
    MSR, New England.

  • 15-02-17
    3:30 pm, Seminar Hall
    Can Machine Learning and Artificial Intelligence influence Advanced Semiconductor Nano Manufacturing Technology?(Abstract)
    Koushik Ragavan
    Applied Materials, Chennai.

  • 14-02-17
    3.30 pm, Seminar Hall
    A Short Course on Algorithmic Program Verification(Abstract)
    Ahmed Bouajjani
    IRIF, Univ. of Paris-Diderot, France.

  • 09-02-17
    3.30 pm, Lecture Hall 804
    A Short Course on Algorithmic Program Verification(Abstract)
    Ahmed Bouajjani
    IRIF, Univ. of Paris-Diderot, France.

  • 09-02-17
    11.30 am, Lecture Hall 4
    Thermal resummation and phase transitions(Abstract)
    Harikrishnan Ramani
    SUNY Stony Brook, USA.

  • 08-02-17
    3.30 pm, Lecture Hall 1
    Some questions on uncertainty principles in harmonic analysis on Lie groups(Abstract)
    Alladi Sitaram
    Chennai Mathematical Institute.

  • 06-02-17
    3:30 pm, Seminar Hall
    Asymptotic Invariants and the Geometry of Rational Surfaces(Abstract)
    Brian Harbourne
    University of Nebraska, USA.

  • 02-02-17
    11.30 a.m., Lecture Hall 4
    Issue in Open Effective Field Theory(Abstract)
    Loganayagam R
    ICTS Bangalore.

  • 25-01-17
    15.30-16.30, Seminar Hall
    WBTS, the new class of WSTS without wqo(Abstract)
    Alain Finkel
    LSV (ENS Cachan), France.

  • 24-01-17
    3.30 pm, Seminar Hall
    10th,12th,17th,19th and 24th January 2017 (Tuesdays/Thursdays)
    SHORT COURSE ANNOUNCEMENT
    A Short Course on the Algorithmic Aspects of WQO Theory(Abstract)
    Philippe Schnoebelen
    CNRS and ENS Cachan.

  • 23-01-17
    14.00-15.00, Seminar Hall
    The Erdos & Tarski Theorem (1943)(Abstract)
    Alain Finkel
    LSV (ENS Cachan), France.

  • 20-01-17
    2.00 - 3.00 p.m., Seminar Hall
    Residual empirical processes(Abstract)
    Hira L. Koul
    Michigan State University, U.S.A.

  • 19-01-17
    3.30 pm, Seminar Hall
    10th,12th,17th,19th and 24th January 2017 (Tuesdays/Thursdays)
    SHORT COURSE ANNOUNCEMENT
    A Short Course on the Algorithmic Aspects of WQO Theory(Abstract)
    Philippe Schnoebelen
    CNRS and ENS Cachan.

  • 18-01-17
    3.30-4.30 p.m., Seminar Hall
    R.K. Rubugunday Distinguished Lecture
    The Grothendieck inequality(Abstract)
    Gadadhar Misra
    IISc, Bangalore.

  • 17-01-17
    3:30 pm, Lecture Hall 802
    A category of probability spaces and a conditional expectation functor(Abstract)
    Yoshihiro Ryu
    Ritsumeikan University, Japan.

  • 17-01-17
    3.30 pm, Seminar Hall
    10th,12th,17th,19th and 24th January 2017 (Tuesdays/Thursdays)
    SHORT COURSE ANNOUNCEMENT
    A Short Course on the Algorithmic Aspects of WQO Theory(Abstract)
    Philippe Schnoebelen
    CNRS and ENS Cachan.

  • 12-01-17
    3.30 pm, Seminar Hall
    10th,12th,17th,19th and 24th January 2017 (Tuesdays/Thursdays)
    SHORT COURSE ANNOUNCEMENT
    A Short Course on the Algorithmic Aspects of WQO Theory(Abstract)
    Philippe Schnoebelen
    CNRS and ENS Cachan.

  • 10-01-17
    3.30 pm, Seminar Hall
    10th,12th,17th,19th and 24th January 2017 (Tuesdays/Thursdays)
    SHORT COURSE ANNOUNCEMENT
    A Short Course on the Algorithmic Aspects of WQO Theory(Abstract)
    Philippe Schnoebelen
    CNRS and ENS Cachan.

  • 06-01-17
    3.30-4.30 p.m., Seminar Hall
    K. Lakshmanan Memorial Distinguished Lecture
    KPZ story(Abstract)
    Satya N. Majumdar
    Directeur de recherche, CNRS, Laboratoire de Physique Theorique et Modeles Statistique, Universite Paris-Sud, France.

  • 06-01-17
    12:00 noon, Seminar Hall
    Constrained Counting and Sampling: Bridging the Gap between Theory and Practice(Abstract)
    Kuldeep Meel
    Rice University, U.S.A.

  • 06-01-17
    10.30 a.m., Seminar Hall
    Tropical Forests, the Global Climate, and You(Abstract)
    Ashwin Ravikumar
    The Field Museum of Natural History, Chicago, U.S.A.

  • 04-01-17
    Two talks between 14:00 and 16:30, at Lecture Hall 1, with a tea-break in between
    (1) Dynamics on the moduli space of pointed rational curves (2) A mirror theorem for symmetric products of projective space(Abstract)
    (1) Rohini Ramadas (2) Robert Silversmith
    Ann Arbor.

  • 04-01-17
    12:00, Seminar Hall
    A Fine-Grained Approach for Designing (Time and Space) Efficient Algorithms(Abstract)
    Rajesh Chitnis
    Weizmann Institute of Science, Rehovot, Israel.





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