Definition) Set
A set in mathematics is a collection of objects (which we call elements) Go to Number Systems, Sets, Unions, And Ordering to look at examples of sets!
Set inlcusion
Set inclusion is a mathematical operation which connects elements to sets. For example, however, 🍇🍍
Def) Function
A function is a mapping from one set to another set. It is usually denoted with a lowercase letter (however sometimes we may see uppercase letters, but I will reserve upper case letters for sets and “linear Transformations”) Formal Definition :
is an example of a function from the reals to the reals. It is denoted as below :