CSUN Algebra, Number Theory, and Discrete Mathematics Seminar

at the Department of Mathematics, California State University, Northridge

Our Next Talk

Wednesday 30 October 2024 2:45 pm–3:45 pm
Live Oak Hall 1328 and via Zoom meeting

Wai Yan Pong
California State University, Dominguez Hills

Pointwise Convexity

We investigate several notions of “convexity at a point” and their relations to global and local convexity. An interesting by-product of this investigation is a construction from a discontinuity of any second derivative a non-convex minimum. Anyone who has a Calculus 1 will enjoy the talk and those who have introduction to analysis will appreciate the proofs. I promise a good story.

Directions: Live Oak Hall (LO) is in cell E3 of this map.
Room 1328 is on the third floor. There is an elevator in Eucalyptus Hall (EH), the adjacent building to the north.

If you are coming by car, the visitor parking is either in lot G3 or structure G3
in cells F3 and G3 of the map, or you may try lot B2 in cells B1-2.

See here for more parking information.

If you wish to attend this seminar via Zoom,
please use the email address below to request the link.

For more information, or to suggest a speaker, contact Daniel Katz
(email: [first name] [dot] [last name] [at] csun [dot] edu).

Schedule of Talks

Fall 2024
30 October 2024	Pointwise Convexity	Wai Yan Pong California State University, Dominguez Hills
16 October 2024	Isomorphism relations on classes of c.e. algebras	Martin Ritter Technische Universität Wien
Spring 2024
01 May 2024	Fundamental Theorem of Algebra, improved	Mohsen Aliabadi University of California, San Diego
21 February 2024	Quasi-Critical Points of Toroidal Belyĭ Maps	Edray Goins Pomona College
Winter 2024
08 January 2024	Birational geometry of some Calabi-Yau threefolds / Clifford groups in Quantum Computing	Ching-Jui (Ray) Lai National Cheng Kung University
Fall 2023
08 November 2023	A Schnyder-type drawing algorithm for 5-connected triangulations	Shizhe Liang Brandeis University
Spring 2023
19 April 2023	Matrices, Polynomials, and Recurrence Sequences over Finite Fields	Sudhir R. Ghorpade Indian Institute of Technology Bombay
06 March 2023	Quasi-hereditary covers, Hecke algebras, and quantum wreath product	Chun-Ju Lai Academia Sinica
22 February 2023	Model Repair of Kripke Structures using group actions	William Cocke Augusta University
Fall 2022
30 November 2022	The structural complexity of models of arithmetic	Dino Rossegger University of California, Berkeley
02 November 2022	Partition Theorems for Internal Colorings	Lynn Scow California State University, San Bernardino
Spring 2022
13 April 2022	Factorization lengths in numerical semigroups	Stephan Ramon Garcia Pomona College
Fall 2021
01 December 2021	Quantify conjugacy of lamplighter groups	Mark Pengitore University of Virginia
16 September 2021	Pairing Strategies for Tic-Tac-Toe on the Boolean Hypercube	Eric Sundberg Occidental College
Spring 2021
28 April 2021	Languages, Alphabets, and Group Theory	Gizem Karaali Pomona College
Fall 2020
14 October 2020	On the number of crossings of convex drawings of graphs	Bernardo Ábrego California State University, Northridge
Spring 2020
11 March 2020	Toward an Approximate Version of the Hanani-Tutte Theorem on Surfaces	Radoslav Fulek University of Arizona
Fall 2019
13 November 2019	Applications of Cayley Digraphs to Waring’s Problem and Sum-Product Formulas	Yeşi̇m Demi̇roğlu Karabulut Harvey Mudd College
31 October 2019	Kříž’s Theorem via dynamics of linear operators	Yunied Puig de Dios University of California, Riverside
22 October 2019	On the interplay of operator theory and combinatorics	Yunied Puig de Dios University of California, Riverside
Spring 2019
24 April 2019	Quotient Rings of Prime Rings	Jerry Rosen California State University, Northridge
10 April 2019	Binomial Probability of Prime Number of Successes	Sungjin Kim California State University, Northridge
Fall 2018
14 November 2018	Small representations of integers by integral quadratic forms	Lenny Fukshansky Claremont McKenna College
24 October 2018	D-optimal weighing designs	Michael G. Neubauer California State University, Northridge
Spring 2018
02 May 2018	On normal generation of line bundles on a surface	Lei Song University of California, Riverside
28 March 2018	Counting objects in algebraic geometry via symmetries	Jason Lo California State University, Northridge
07 March 2018	Reversed Dickson permutation polynomials	Neranga Fernando Northeastern University
Fall 2017
21 November 2017	Gershgorin’s disks	Imre Bárány Rényi Mathematical Institute, Hungarian Academy of Sciences and University College London
08 November 2017	Recognizing Weak Embeddings of Graphs	Csaba D. Tóth California State University, Northridge
13 September 2017	Belyi maps and dynamics	Irene Bouw Institute of Pure Mathematics Ulm University
Spring 2017
12 April 2017	Twisted differential maps and differential algebraic independence	Wai Yan Pong California State University, Dominguez Hills
11 April 2017	Stable bundle/sheaf/complex and Bogomolov inequalities	Cristian Martinez University of California, Santa Barbara
29 March 2017	Book Crossing Numbers of Complete Graphs	Silvia Fernández-Merchant California State University, Northridge
Fall 2016
16 November 2016	Peak Polynomials: Positivity and Generalizations to Graphs	Mohamed Omar Harvey Mudd College
31 October 2016	Hasse principle and norm equations	Eva Bayer École Polytechnique Fédérale de Lausanne
Spring 2016
20 April 2016	Generation Problems for Classical Algebraic Groups	Spencer Gerhardt University of Southern California
24 February 2016	Lattice spanners of low degree	Adrian Dumitrescu University of Wisconsin-Milwaukee
Fall 2015
18 November 2015	Spherical designs and lattices	Hiren Maharaj Pomona College
28 October 2015	Climbing the tower of covers to understand $π_{1}$	Katherine F. Stevenson California State University, Northridge
Spring 2015
29 April 2015	Solving quadratic equations over $Q$ -bar	Lenny Fukshansky Claremont McKenna College
25 March 2015	Children’s drawings, flat refinements, and geometric construction of number fields with controlled ramification	Majid Hadian California Institute of Technology
18 March 2015	Arc diagrams, flip distances, and Hamiltonian triangulations	Michael Hoffmann Eidgenössische Technische Hochschule (ETH) Zürich
04 March 2015	Lattices from function fields and lattices from finite Abelian groups	Hiren Maharaj Pomona College
25 February 2015	Elementary Matrix Theory and Azumaya Algebras in the (Dis)Service of Wireless Communication	Bharath A. Sethuraman California State University, Northridge
Fall 2014
03 December 2014	Unimodular congruence of the Laplacian matrix for a graph	William Watkins California State University, Northridge
12 November 2014	Maximizing the number of copies of a pattern	Bernardo Ábrego California State University, Northridge
15 October 2014	On Modular forms and their applications	Anne-Maria Ernvall-Hytönen University of Helsinki