Category Archives: Cool Ideas

Infinity

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Similar Functions

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How Could I Resist?

I am reading A Course on Quantum Techniques for Stochastic Mechanics by John C. Baez and Jacob D. Biamonte in bits and pieces as I have time.  I am finally lost.  This is my fault since I haven’t stopped to do the exercises, but … Continue reading

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Cool Factoring Visualization

Check out this visualization of prime factorizations: Prime Number Patterns. Mouse around.  The actual numbers can be read at the bottom of the screen.

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Edging Coloring Complete Graphs – Two Examples

Dr. John Caughman from Portland State University presented our Kieval Lectures this year.  He described rainbow graphs and matching, rectangle graphs and lattice paths. I intended to take notes because of past experience but I got so interested that I just … Continue reading

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Divisibility by 17

I thought that a test for divisibility by 17 ought to work like the test for divisibility by 13 that I described in my last post.  No such luck.  But something similar does work. And here is a rough explanation why the method works.

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Divisibility Test for Thirteen

My department chair, Sherry Ettlich, sent us a link to this video which shows a quick (new?) method of determining if a number is divisible by 7. After I figured out how it worked, it occurred to me to try the same … Continue reading

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