A good way of proving that a set is countable
A quick way of recognising countable sets
Before posting from this form, please consider whether it would be more appropriate to make an inline comment using the Turn commenting on link near the bottom of the window. (Simply click the link, move the cursor over the article, and click on the piece of text on which you want to comment.)
View a list of all articles.
Comments
Post new comment
(Note: commenting is not possible on this snapshot.)