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January 2013. In order to read the updated and more complete version of this post click here:Parashah VaEra and Bo “Every first-born in Egypt will die...”

January 2013

[Please read the essential constructs in the right column. FRACTAL Sequencing and animation MACHINE. The shape you see is the combined output of the controls below.

FRACTAL Sequencing and animation MACHINE

Mouse over them to see what they do. If the page gets too slow, turn some of the parameters down. Hyperbolic Orthogonal Dodecahedral Honeycomb. Geometry Expressions. George W. Hart. Slide-Together Geometric Constructions. This is a web version of a teacher's workshop presented at Bridges 2004Appeared in: Bridges for Teachers, Teachers for Bridges, 2004 Workshop Book, Mara Alagic and Reza Sarhangi eds., pp. 31-42.

Slide-Together Geometric Constructions

“Slide-Together” Geometric Paper Constructions George W. A First Course in Linear Algebra (A Free Textbook) Open-Source Textbooks Instead I am concentrating recommendations and examples within the undergraduate mathematics curriculum, so please visit the Open Math Curriculum page.

A First Course in Linear Algebra (A Free Textbook)

If you are linking to this site, please use that page for a broad list, or link to specifically for the Linear Algebra text. Thanks for your help publicizing open textbooks. Harmonograph. A harmonograph output A harmonograph is a mechanical apparatus that employs pendulums to create a geometric image.


The drawings created typically are Lissajous curves, or related drawings of greater complexity. The devices, which began to appear in the mid-19th century and peaked in popularity in the 1890s, cannot be conclusively attributed to a single person, although Hugh Blackburn, a professor of mathematics at the University of Glasgow, is commonly believed to be the official inventor.[1] The KnotPlot Site.

What's Special About This Number? What's Special About This Number?

What's Special About This Number?

If you know a distinctive fact about a number not listed here, please e-mail me. primes graphs digits sums of powers bases combinatorics powers/polygonal Fibonacci geometry repdigits algebra perfect/amicable. §. The Buckminster Fuller Institute.