Method on @infsup: gamma (X)

Compute the gamma function.

             ∞
            /
gamma (x) = |t^(x - 1) * exp (-t) dt
            /
           0

Accuracy: The result is a valid enclosure. The result is tightest for X >= -10.

gamma (infsup (1.5))
  ⇒ ans ⊂ [0.88622, 0.88623]

See also: @infsup/psi, @infsup/gammaln, @infsup/factorial.

Package: interval