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, 2018: Visitor to University of Arizona Mathematics Department, Tucson, AZ.

Due to changes at HSU watch for the move of most of this web site to by Jan., 2019.

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)

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]
Borderland Math Teachers Circle, U of AZ, South Campus, "
Mapping (Function) Diagrams to Visualize and Make Sense of Solving Linear and Quadratic Equations," November 14, 201 7 [Links]
AMATYC Conference, 2017, "Using Mapping Diagrams to Make Sense of Functions and Equations",
November 11, 2017 [Links]
Arizona State University, Mathematics Education Colloquium,
"Making Sense of Calculus with Mapping Diagrams:A Visual Alternative to Graphs", November 3, 2017
University of Arizona
.Center for Recruitment and Retention of Mathematics Teachers, Workshop,
"Using Mapping Diagrams to Make Sense of Functions and Calculus," Part I,
October 18, 2017. [Links I] Part II [Links II]
HSU Math Department Colloquium, "Solving Polynomial Equations: Visualization from Linear to Cubic,from Rational to Complex Numbers", 9-24-2017
Recent(and not so Recent - back to 2011) Stuff 

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.



This site is still under reorganization.
Links are being reconfigured and some are inactive or incorrect.
Older pages need reworking to be made handicapped accessible.
Links starting with "" are being readdressed as needed with ""
I continue to work on this.
Flash     :)