Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Infinite set
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
===Countably infinite sets=== The set of all [[integer]]s, {..., −1, 0, 1, 2, ...} is a countably infinite set. The set of all even integers is also a countably infinite set, even if it is a proper subset of the integers.<ref name=":1">{{Cite web|url=https://primes.utm.edu/glossary/page.php?sort=Infinite|title=The Prime Glossary β Infinite|last=Caldwell|first=Chris|website=primes.utm.edu|access-date=2019-11-29}}</ref> The set of all [[rational number]]s is a countably infinite set as there is a bijection to the set of integers.<ref name=":1" />
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)