[7] such a function always takes the same value (in this case 5), because the variable does not appear in the expression defining the function A constant coefficient, also known as constant term or simply constant, is a quantity either implicitly attached to the zeroth power of a variable or not attached to other variables in an expression In computer programming, a constant is a value that is not altered by the program during normal execution
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When associated with an identifier, a constant is said to be named, although the terms constant and named constant are often used interchangeably
This is contrasted with a variable, which is an identifier with a value that can be changed during normal execution
List of mathematical constants a mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems Physical constant, a physical quantity generally believed to be universal and unchanging constant (computer programming), a value that, unlike a variable, cannot be reassociated with a different value logical constant, a symbol in symbolic logic that has the same meaning in all models, such as the symbol = for equals A variable may denote an unknown number that has to be determined In which case, it is called an unknown
For example, in the quadratic equation ax2 + bx + c = 0, the variables a, b, c are parameters, and x is the unknown Sometimes the same symbol can be used to denote both a variable and a constant, that is a well defined mathematical object. The graph of the constant function y = c is a horizontal line in the plane that passes through the point (0, c)
