A and the set B = {x, y}, then A X B is denumerable as well.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.1: Postulates For The Integers (optional)
Problem 29E
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I'm trying to prove that if given the innumerable set A and the set B = {x, y}, then A X B is denumerable as well.
Proof:
All I have so far is that, assuming A is denumerable, we can create the sequence A = a1, a2, a3, ... By definition of cross-product, we can then form the sequence A X B = a1x, a1y, a2x, a2y, a3x, a3y, ...
It should be clear that this sequence includes every element of AXB as, as such, A X B is denumerable.
I am not entirely sure that this argument is valid.
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