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1d
comment Fermat Last Theorem for non Integer Exponents
Do you have an example for n rational and > 2?
Feb
17
comment Euler's totient function
This was mentioned in one or more answers, but just to restate as a comment: the totient function is not always the product of one less than the prime factors; if a number has n multiples of the same prime factor, you use p^n - p^(n-1); in the case where n==1, you would use p - p^0 which is p - 1.
Nov
8
comment Division by $0$
Huh? The elementary definition of division is a / b = c is equivalent to dividing a into c groups of size of b which can be manually calculated by subtracting b repeated from a until the remainder is 0 (for when a is divisible by b) or at least less than b.
Nov
3
comment Father and daughter river crossing puzzle.
Another variant (Italian I think) relaxes constraint 3 to allow the case where the man won't ravish someone's sister if his sister is also present as a chaperone)
Aug
3
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