MATH STINGER #58 
by Dr. Joel C. Fowler 
Assistant Professor of Mathematics 

The puzzle for this issue is to find a formula for all pairs of distinct (i.e. different) 
positive rational numbers, x and y, that satisfy: x^y = y^x, where ^ denotes 
exponentiation. Recall that a rational number is one that can be expressed as the ratio of two integers.

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