How do you remove an invalid remote branch reference from Git?

Question

In my current repo I have the following output:

$ git branch -a
* master
  remotes/origin/master
  remotes/public/master

I want to delete <

Answer 1

git push public :master

This would delete the remote branch named master as Kent Fredric has pointed out.

To list remote-tracking branches:

git branch -r

To delete a remote-tracking branch:

git branch -rd public/master