The (for all) symbol is used in math to describe a variable in an expression. Typically, the symbol is used in an expression like this:
In plain language, this expression means for all in the set of real numbers. Then, this expression is usually followed by another statement that should be able to be proven true or false. Read more…
The member of symbol indicates that an expression belongs to or is in the set.
There exists symbol.
The ∀ (for all) symbol is used in math to describe the meaning of one or more variables in a statement.