Question 193990
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In mathematics, a natural number originally meant an element of the set {1, 2, 3, ...} (the positive integers). Currently in fields like mathematical logic, set theory, and computer science it is defined as an element of the set {0, 1, 2, 3, ...} (the non-negative integers).  However, most sources define it the first way, that is, excluding zero.  That's the way I learned it in Jr High School also, but then again that was almost 50 years ago.


So take your pick.  What does your instructor/textbook say?


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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