Minus Symbol
The minus symbol is an arithmetic operator used to represent subtraction.
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Usage
Subtraction  Operator
Subraction is a basic arithmetic operation of taking away one number from another number.
Set Difference  Notation
The minus symbol is used in set theory to represent the difference operator for two sets. The operation removes all elements found in one set from another and returns the resulting set.
Subtraction  Notation
In mathematics the minus symbol represents the subtraction operator. The expression on the right is subtracted from the expression on the left.