Saturday, October 21, 2017

Introduction



In this series of blog posts I will present a proof that the set of Natural Numbers, N, is not countable. Intuitively it seems self-evident that the elements of N can be enumerated simply by listing them 1, 2, 3, 4… n, …  To demonstrate that N is uncountable I will construct a natural number, Y (called a straggler), derived from the process of listing N such that Y will never appear in the list. 

The tools employed in proving the theorem are proof by construction, which I will use to derive Y from the listing of N, mathematical induction, which will show that Y will not be in the enumeration of N for P(1), P(n) and P(n+1) iterations of the computer program used to generate N, and lastly, contradiction wherein I will show that the creation of Y contradicts the assumption that N is numerable. 

Next I will review Cantor's Diagonal method to show how employing it creates a straggler in the list of  real numbers on the (0, 1) interval.




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