Constants have many meanings:
1, the specified quantity and number.
2, a certain regularity of repetition.
3. A certain number or usual number.
4. A certain order.
5. Mathematical terminology. A fixed value. For example, the ratio of circumference to diameter (t) of a circle is about 3. 14 159, and the expansion coefficient of iron is 0.0000 12. Constant is a name with a certain meaning, which is used to replace numbers or strings, and its value never changes.
Mathematical constants refer to constants with constant values, as opposed to variables. Unlike most physical constants, the definition of mathematical constants has nothing to do with all physical measurements. Mathematical constants are usually elements of real or complex fields. Mathematical constants can be called definable numbers (usually computable).
Other alternative representations can be found in mathematical constants (arranged by continued fraction). A constant, also called a definite number, refers to a constant with a constant value, as opposed to a variable. (Constant refers to a number greater than zero)
6. Physical terminology. In physics, many measured values are called constants. For example, the coefficient of universal gravitation and
Surface gravity acceleration, etc. However, some studies show that some of these constants are not constants, so they are called "indefinite"
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