Board Thread:Fun and Games/@comment-28680672-20180821160328/@comment-25856498-20180928123011

My last maths class in a nutshell:

Injection: A function that is one-to-one

Surjection: A function that maps to all elements in the output set

Bijection: A function that is both an injection and a surjection

Objection: Something I wanted to shout after learning the above