Mathematical constant

From Wikipedia, a free encyclopedia written in simple English for easy reading.

A mathematical constant is a number, which has a special meaning for calculations. For example, the constant π (spoken as "pi") means the ratio of the length of a circle's circumference to its diameter. This value is always the same for any circle. In contrast to physical constants, mathematical constants do not come from physical measurements.

[edit] Some mathematical constants

Here are some important mathematical constants
Name Symbol Value Meaning
Pi, Archimedes' constant or Ludoph's number π ≈ 3.141592653589793 ratio of the length of a circle's circumference to its diameter, area of the unit circle
E, Napier's constant e ≈ 2.718281828459045 base of natural logarithm
Golden mean φ \frac{\sqrt{5}+1}{2} \approx 1.618033988749895 It is the ratio of a larger value to a smaller value if this is equal to the ratio of the sum of the values to the larger value.