Personal Website of Bishal Deb

Past and Upcoming Talks

2026

• January 6th, 2026: Continued fractions using a Laguerre digraph interpretation of the Foata–Zeilberger bijection and its variants, at Center for Combinatorics, Nankai University, Tianjin, China.
  
  
  
  2025

  December 17th, 2025: Total positivity of three types: conjectures and observations, at Dalian University of Technology, Dalian, China.

  November 15th, 2025: Coefficientwise total positivity of Hankel matrices in counting problems, at Postdoc Workshop VII, Yau Mathematical Sciences Center.

  June 21st, 2025: A production matrix for the Schett polynomials via checkerboard exponential Riordan Arrays, at the 10th International Conference on Riordan Arrays and Related Topics, Jiangsu Normal University, Xuzhou, China.

  April 9th, 2025: Some bijections in the n! garden, at Ahmedabad University.

  February 4th, 2025: Coefficientwise total positivity of Hankel matrices in counting problems, at Al-Khwarizmi Applied Mathematics Webinar. Talk recording.
  2024

  September 23rd, 2024: Continued fractions using a Laguerre digraph interpretation of the Foata--Zeilberger bijection and its variants, at the Laboratoire Bordelais de Recherche en Informatique, Bordeaux, France.

  August 28th, 2024: Coefficientwise total positivity of Hankel matrices in counting problems, at Ahmedabad University.

  July 3rd, 2024: Continued fractions using a Laguerre digraph interpretation of the Foata--Zeilberger bijection and its variants, at the 30th British Combinatorial Conference.

  June 14, 2024: Coefficientwise-Hankel total positivity of the Laguerre polynomials, at Laboratoire de Probabilités, Statistique et Modélisation

  June 7, 2024: Coefficientwise total positivity of Hankel matrices in counting problems, at Institut de Mathématiques de Jussieu-Paris Rive Gauche.

  May 28, 2024: Coefficientwise-Hankel total positivity of the Laguerre polynomials, at Laboratoire d'informatique de Paris-Nord.

  May 24, 2024: Coefficientwise-Hankel total positivity of the Laguerre polynomials, at University of Tours.

  April 16, 2024: Continued fractions using a Laguerre digraph interpretation of the Foata--Zeilberger bijection and its variants, at the Institut Camille Jordan, Lyon, France.

  March 26, 2024: Continued fractions using a Laguerre digraph interpretation of the Foata--Zeilberger bijection and its variants, at the Institut de Recherche en Informatique Fondamentale, Paris, France.

  February 27, 2024: Coefficientwise Hankel-total positivity of the Schett polynomials, at Chennai Mathematical Institute, Chennai, India.

  February 23, 2024: Accumulation of zeroes for polynomials with combinatorial significance, at Combinatorics-related Open Problems Seminar (CROPS)
  2023

  September 5, 2023: Continued fractions using a Laguerre digraph interpretation of the Foata--Zeilberger bijection and its variants, at International Conference on Enumerative Combinatorics and Applications (ICECA) 2023. Talk recording Slides

  July 6, 2023: Continued fractions using a Laguerre digraph interpretation of the Foata--Zeilberger bijection and its variants, at Permutation Patterns 2023, University of Burgundy, Dijon, France. Slides

  May 23, 2023: Laguerre digraphs and continued fractions, at Scottish Combinatorics Meeting 2023, University of Strathclyde, UK. Slides

  May 11, 2023: The "quadratic family" of continued fractions and combinatorial sequences, at Topics in Special Functions and Number Theory (SFNT). Talk recording. Slides
  2022

  August 23, 2022: Combinatorics and total positivity, at Chennai Mathematical Institute, Chennai, India. Slides

  August 17, 2022: Continued fractions and combinatorial sequences: factorials, Genocchi and median Genocchi numbers, at the Institute of Mathematical Sciences, Chennai, India. Slides

  June 9, 2022: Multivariate continued fractions associated to Genocchi and median Genocchi numbers, at Positivity Problems Associated to Permutation Patterns, Lancaster University, UK.

  April 20, 2022: Combinatorics of continued fractions in the realm of permutations and Genocchi numbers, at Graduate Online Combinatorics Colloquium (GOCC). Talk recording

  March 26, 2022: Combinatorics of continued fractions in the realm of permutations and Genocchi numbers, at Graduate Student Combinatorics Conference (GSCC) 2022. Talk recording

  March 9, 2022: Combinatorial Hodge Theory, at UCL-LSE combinatorics reading group. Spoke about https://arxiv.org/abs/1511.02888.
  2021

  November 18, 2021: Analysing a strategy for a card guessing game via continuously increasing subsequences in multiset permutations at Algebra, Representations, Combinatorics and Symmetric functions in India. Talk recording.

  November 15, 2021: Analysing a strategy for a card guessing game via continuously increasing subsequences in multiset permutations at UCL Combinatorics Seminar series.

  July 16, 2021: Total positivity of the Eulerian triangle: A big generalisation of Brenti’s conjecture, at British Early Career Mathematicians Colloquium 2021.

  June 8, 2021: Total positivity of the Eulerian triangle: A big generalisation of Brenti’s conjecture, at Young Researchers in Mathematics 2021.

  April 24, 2021: Total positivity of the Eulerian triangle: A big generalisation of Brenti’s conjecture, at Graduate Student Combinatorics Conference (GSCC) 2021. Talk recording
  2020

  November 17, 2020: Total Positivity during Distressing Times, talk at the mathematics department postgraduate students seminar at University College London.

  July 31, 2020: Combinatorics of Stammering Tableaux, Online Weekly Research Seminar for Early Career Mathematicians from India. Slides
  2019

  September 14, 2019: A Mathematical Pursuit of Happiness, outreach talk to mathematics undergraduates at Digboi College, Assam, India.

  May 20th, 2019: Chromatic Polynomials and Heaps of Pieces at the weekly seminar of the Combinatorics and Interactions working group at Université de Bordeaux, France.
  2017

  March 14th, 2017: Chromatic Polynomials and Heaps of Pieces at Institute of Mathematical Sciences, Chennai.