Variable DeclarationLet $x$ be a~Let $F$ denote any~For a real number $x$, ~Supposing PartLet suppose that ~Let assume that ~Suppose that ~Assume that ~Definition PartWe define ~ by ~, as~We say that ~A ~~ is said to be ~ (주로 형용사일 때)~ is referred to as ~A ~~ is called ~~ (주로 명사일 때)