Martin Flashman

I am a Professor Emeritus of Mathematics at Humboldt State University in Arcata, CA, currently Designated Campus Colleague at the University of Arizona in Tucson, AZ.  I have a long time interest in making sense of mathematics with visualizations- at levels from basic algebra and geometry through real and complex analysis, linear and abstract algebra, and projective and hyperbolic geometries, both synthetic and algebraic.  My current focus is on using mapping diagrams to visualize the analysis of functions and solving equations in many contexts using GeoGebra in 2 and 3 dimensions for real and complex variables.I make presentations at colleges and universities and national and regional meetings and conferences using GeoGebra. I made presentations were at the 2018 Joint Math Meetings in San Diego, CA and the 2018 British Congress of Mathematics Education at University of Warwick, England. More recently:

Joint Mathematics Meetings, San Francisco, CA.
    AMS Special Session on Mathematics and Philosophy."Do We Need a Separate Philosophy of Geometry?" Jan. 5, 2024.
Fall 2023 ArizMATYC Conference, Chandler AZ. "Visualizing the algebra of equations and inequalities with mapping diagrams." October 6, 2023
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48th AMATYC Annual Conference Virtual Days. "Darts-Visualizing Probability: Simulations, Graphs & Mapping Diagrams" . (GeoGebra book with video) Dec 2, 2022.

ArizMATYC/MAA Southwestern Section Joint Conference, "Visualizing Linear and Nonlinear Functions and Transformations of Several Variables with Mapping Diagrams"
    ASU Polytechnic Campus, April 1, 2022 (GeoGebra Book: https://flashman.tiny.us/ArizMATYC)

CMC-South Annual Conference 2021, "Visualizing the Algebra of Equations with Mapping Diagrams". November 6, 2021. (Links)

14th International Congress on Mathematical Education, "MAPPING DIAGRAMS: FUNCTION VISUALIZATION OF REAL AND COMPLEX ANALYSIS AND MATRIX ALGEBRA", Shanghai, July 14, 2021. Topic Study Group 23 Visualization in the teaching and learning of mathematics (GeoGebra Book includes Paper) (On YouTube)

ATM Conference 2021. "Visualizing the algebra of equations and inequalities with mapping diagrams", April 7 & 8,2021. (Links)

AMATYC Webinar, "Visualizing Solving Equations with Function Mapping Diagrams"  September 22, 2020. (On YouTube.)

Joint Mathematics Meetings Denver, CO Jan. 15&17, 2020: MAA Minicourse 2020: Visual Complex Analysis- GeoGebra Tools and Mapping Diagrams GeoGebra Book.