Due to COVID-19, many mathematical seminars, conferences, and research lectures have changed to an online format. This is a list of free offerings of this nature, sorted by mathematical field. The list does not include regular classes or online education in general.

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Real, Complex, Functional, Harmonic Analysis (and Topological Groups)

**Algorithms for Dimension and Complexity Reduction**, Workshop, Institute for Computational and Experimental Research in Mathematics (ICERM). Lecture links appear at the bottom of the Workshop web page. Originally scheduled for March 23-27, 2020; offered virtually only.

Geometry / Topology

**Algebraic Topology From A Geometric Viewpoint**, Dev Sinha, University of Oregon and MIT. Seminar web page.**Derived Stacks as Infinity-Groupoids in Categories of Fibrant Objects**, Prof. Ezra Getzler, Northwestern University. Mathematical Sciences Research Institute (MSRI). On YouTube.**WAGON (for Western Algebraic Geometry ONline)**, Nick Addington, Juliette Bruce, Johan de Jong, Ariyan Javanpeykar, Valentijn Karemaker, etc., WAGS (Western Algebraic Geometry Symposium) Spring 2020 virtual edition. Through Zoom, see the Conference page for details.

Discrete Math / Combinatorics / Logic / Computer Science

**Logics in quarantine**, Brazilian Logic Society, see the seminar's page for details.**Virtual Combinatorics Colloquium**, ongoing, hosted by the Northeast Combinatorics Network. Colloquium site.**Derived Stacks as Infinity-Groupoids in Categories of Fibrant Objects**, Prof. Ezra Getzler, Northwestern University. Mathematical Sciences Research Institute (MSRI). On YouTube.**WAGON (for Western Algebraic Geometry ONline)**, Nick Addington, Juliette Bruce, Johan de Jong, Ariyan Javanpeykar, Valentijn Karemaker, etc., WAGS (Western Algebraic Geometry Symposium) Spring 2020 virtual edition. Through Zoom, see the Conference page for details.

Probability

**One World Probability Seminar**, University of Mannheim. Overview and schedule.

Biostatistics / Statistics

**COVID-19: The Exponential Power of Now**, Prof. Nicholas Jewell. Mathematical Sciences Research Institute (MSRI). On YouTube. Recorded March 19, 2020. “Where are we with COVID-19, and how are mathematical models and statistics helping us develop strategies to overcome the burden of infections. Nicholas P. Jewell is Chair of Biostatistics and Epidemiology at the London School of Medicine and Tropical Medicine and Professor of the Graduate School (Biostatistics and Statistics) at the University of California, Berkeley.”

Linear, Non-linear Optimization / Control

**One World Optimization Seminar**. University of Vienna. Overview and schedule.

Differential, Integral, Difference Equations

**One World PDE Theory Seminar**. Overview and schedule.

Mathematics Education

**Electronic Seminar in Mathematics Education**, MIT, Cornell, TPSE Math. Live via Zoom on alternate Tuesdays at noon ET; or view recordings from past seminars. Seminar web page.

Data science

**One World Seminar: Mathematical Methods for Arbitrary Data Sources (MADS).**Applied Mathematics Inverse Problems. Overview and schedule.

Applied Mathematics

**One World Seminar Series: IMAGing and INvErse problems (IMAGINE) Seminar.**Overview and schedule.**UMKC Math & Stat Research Day,**Friday April, 17, 2020, has a focus on COVID-19 and disease modeling. Through Zoom, there is no restriction for joining or leaving the zoom meeting. Find the schedule on UMKC's web page (talks will be recorded and placed on the web page).**Waves in One World (One World Seminars).**ICMS, Edinburgh. Overview and schedule.

Other

**One World Seminar Mathematical Game Theory Seminar.**Gamenet. Overview and schedule.

All Areas

**Talk Math with your Friends**, (#TMWYF on Twitter) is a weekly virtual mathematics colloquium created to provide a replacement of sorts for mathematics departments' weekly colloquia during the COVID-19 shutdown of colleges and universities. Through Zoom, find details on the web page.