An arithmetic progression is a sequence of 3 or more integers whose terms differ by a constant, e.g., 20, 23, 26, 29...

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## Van der Waerden Theorem

Can you color the integers red and blue such that there are no monochromatic arithmetic progressions (AP’s) extending infintely in...

Continue reading...## Four Fours Problem

Here’s a challenge that you may wish to try: can you express all the numbers from 1 to 100 using...

Continue reading...## Proof with Words

2 + 11 – 1 = 12. Figure 1 demonstrates a “proof with words”! Presentation Suggestions:Write the letters for two and...

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