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Finite versus infinite sets. Equipotent sets. Countable sets. Example – SERENDIPITY: SEEKING INTELLIGENT LIFE ON EARTH
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SOLVED: Give an example of two different uncountable sets A and B such that A - B is 1. finite. 2. countably infinite. 3. uncountable. 2. Prove that the set of irrational
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Countable Set - GeeksforGeeks
L01_LanguagesCountability
SOLVED: Show that: 1) N-1,-2,-3 is a denumerable set 2) N∪-1,-2,-3 is a countable set 3) 5,6,7, ... is an infinite set N is the set of odd positive integer numbers.
lec28 Examples of Countably Infinite Sets - YouTube
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elementary set theory - On countable sets - Mathematics Stack Exchange