Department of Mathematics
Humboldt State University
Arcata, CA 95521

EMAIL:flashman at
Cell Phone: 707-832-9973
Illustrating Desargues' Theorem with a            3-D Model.

At Forty-Second Annual State of Jefferson Mathematics Congress October 5, 2013
Professor Emeritus of Mathematics

Fall, 2017 - Spring, 2020: Visitor to University of Arizona Mathematics Department, Tucson, AZ.

Find out about the Sensible Calculus Program (Older Version.)

Mapping Diagrams from A(lgebra) B(asics) to C(alculus) and D(ifferential) E(quation)s. A Reference and Resource Book on Function Visualizations Using Mapping Diagrams (In Development-Draft Version 8-2017)
Papers/Presentations/etc. [2018-2020]

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.
HSU Math Department Colloquium,
"Linear Algebra & Mapping Diagrams: Old & New Visualizations"
(GeoGebra Book)  Sept. 5, 2019.
Proceedings of Bridges 2019: Mathematics, Art, Music, Architecture, Education, Culture, Edited by Goldstine, McKenna, and Fenyvesi, July, 2019, pp 295-302.

    "Mapping Diagrams and a New Visualization of Complex Functions with GeoGebra"
    Mapping Diagrams and Visualization of Complex Function. GeoGebra book,, July, 2019.
MEI Conference 2019 (Bath, UK), Saturday, June 29, 2019.
    "Visualizing Functions with Mapping Diagrams"
    "Visualizing Calculus with Mapping Diagrams"
ICTCM 2019 (Scottsdale, AZ). Saturday, March 16, 2019.
    "GeoGebra Tools for Visualizing Integration with Mapping Diagrams"
    "GeoGebra Tools for Creating Mapping Diagrams: From Worksheets to Books"
ArizMATYC Conference (Phoenix, AZ),
Friday October 5, 2018. [Links]
   "Making Sense of Integration Visually: Mapping Diagrams for Calculus"
"Solving Polynomial Equations: Visualization from Linear to Cubic, from Rational to Complex Numbers".  
HSU Math Department Colloquium,
"How Many Ways Can You Solve a Quadratic Equation Visually? From the Greeks to 21st Century Technology." Sept. 13, 2018.[Links]
British Congress of Mathematics Education 9, [Sessions A20, D20, E20, H20] April 3-6, 2018, University of Warwick. [
    Informal Proceedings 13- Mapping Diagrams: Four Sessions, One Theme. Using Mapping Diagrams in Algebra, Calculus, and Complex Analysis 
Sacramento Valley Community College Mathematics (SVCCM) Conference,
American River College (Sacramento), "Solving Polynomials: Mapping Diagram Visualization", Saturday, March 3, 2018.
Joint Mathematics Meetings
San Diego, CA, Jan. 13, 2018:
    "Mapping Diagrams Visualizing Functions and Equation Solutions: From Algebra Basics to Real and Complex Analysis." AMS Special Session on Visualization in Mathematics:  Perspectives of Mathematicians and Mathematics Educators. [Links]
    "Making Sense of Complex Integration: Mapping Diagrams Created with GeoGebra to Visualize Definitions, Theory and Applications." MAA Session on Revitalizing Complex Analysis [Links]

Recent (back to 2011) Stuff.

Not So Recent (before 2011) Stuff.

My Bookmarks (old)
A resume.(pdf) ; A biographical sketch.

POM SIGMAA (Philosophy of Mathematics) Find out more about this Special Interest Group of the MAA. 
HOM SIGMAA (History of Mathematics)  Find out more about this Special Interest Group of the MAA.


WORK IN PROGRESS (7-13-2019)

This site is still under reorganization. It is now moved from a server at Humboldt State University to one at
Links are being reconfigured and some are inactive or incorrect.
Older pages need reworking to be made handicapped accessible.
Links starting with "users," are being readdressed as needed with ""
I continue to work on this.
Flash     :)