The meaning of boolean is of, relating to, or being a logical combinatorial system (such as boolean algebra) that represents symbolically relationships (such as those implied by the logical operators.
Boolean algebra is about true and false and logic.
The simplest thing we can do is to not or invert:
Not true is false.
In mathematics and mathematical logic, boolean algebra is a branch of algebra.
It differs from elementary algebra in two ways.
First, the values of the variables are the truth values true and false,.