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. It is variously denoted by
,
, or
.
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.
: degrees to radians conversion factor
