New applet: Domain and range investigation

9 May 2017

domain and range applet
This interactive applet allows you to explore the concepts of domain and range for several different mathematical functions.

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Math movie: The exceptional life of Benjamin Banneker

19 February 2017

The exceptional life of Benjamin Banneker
Self-taught mathematician and astronomer Benjamin Banneker excelled despite little formal education and prejudice.

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What’s the correct graph of sec(arccos(x))?

29 January 2017

What is the graph of y = sec(arccos(x))?
Here we solve another graph mystery - what is the correct domain for y = sec(arccos(x))? And why do different software packages show similar, but different graphs?

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Review: Manga Guide to Regression Analysis

3 September 2016

Manga Guide to Regression Analysis
The Manga Guide to Regression Analysis continues the tradition of presenting math through comics. Here's my review.

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SquareCirclez is a “Top 100” math blog!

29 August 2016

SquareCirclez in Top 100 Math Blogs collection
I was humbled this week to receive notice that SquareCirclez (the IntMath Blog) has been included in a list of the "Top 100 Math Blogs".

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The real story behind the Tesla Map to Multiplication chart

10 July 2016

Tesla multiplication applet
The fascinating Map to Multiplication may not be all it seems, notwithstanding its cleverness.

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Intersection of 3 planes at a point: 3D interactive graph

28 June 2016

solution of a system of 3x3 equations is intersection of 3 planes
This 3D planes applet allows you to explore the concept of geometrically solving 3 equations in 3 unknowns.

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Conic sections interactive applet

25 May 2016

Conic sections interactive applet
This interactive applet allows you to explore the concept of slicing a cone by a plane at various angles and positions, resulting in conic sections.

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Geometric shapes in ancient rock art paintings

19 April 2016

rock art
Ancient rock art may give clues to the origin of written symbols, including early math notation.

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New 3D interactive graph

13 April 2016

3D interactive graph applet - background
I recently added a 3D interactive graph which you can use to explore the x-, y- and z-axis system.

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