For any n+1 integers, some difference of two of them is divisible by n - Pigeonhole Principle
Today we are going to see an application of the pigeonhole principle to divisibility (a number-theoretic claim). Watch carefully how in the proof the pigeonhole principle gives us numbers to play around with! We use the Quotient-Remainder Theorem to do a lot of heavy lifting for us!
Time Stamps:
0:00 Opening, background on divisibility and Quotient-Remainder Theorem
3:57 Given any set of n+1 integers, there are two of them whose difference is divisible by n (full proof)
19:40 Summary
21:26 Closing
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