3.2.9 Mathematical Constants

I
Infinity
Pi
Degree	: degrees to radians conversion factor
GoldenRatio
E
EulerGamma	Euler's constant
Catalan	Catalan's constant
Khinchin	Khinchin's constant
Glaisher	Glaisher's constant

Euler's constant EulerGamma is given by the limit . It appears in many integrals, and asymptotic formulas. It is sometimes known as the Euler-Mascheroni constant, and denoted .

Catalan's constant Catalan is given by the sum . It often appears in asymptotic estimates of combinatorial functions.

Khinchin's constant Khinchin (sometimes called Khintchine's constant) is given by . It gives the geometric mean of the terms in the continued fraction representation for a typical real number.

Glaisher's constant Glaisher (sometimes called the Glaisher-Kinkelin constant) satisfies , where is the Riemann zeta function. It appears in various sums and integrals, particularly those involving gamma and zeta functions.