![general topology - Example of countably infinite sets that is connected? - Mathematics Stack Exchange general topology - Example of countably infinite sets that is connected? - Mathematics Stack Exchange](https://i.stack.imgur.com/17zgq.png)
general topology - Example of countably infinite sets that is connected? - Mathematics Stack Exchange
![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. 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.](https://cdn.numerade.com/ask_images/8b636a5f70374e68b747d16db4c8715c.jpg)
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.
![Finite versus infinite sets. Equipotent sets. Countable sets. Example – SERENDIPITY: SEEKING INTELLIGENT LIFE ON EARTH Finite versus infinite sets. Equipotent sets. Countable sets. Example – SERENDIPITY: SEEKING INTELLIGENT LIFE ON EARTH](https://teepee12.files.wordpress.com/2017/09/finiteandinfinitesets.jpg?w=960)