Function pow

src/compute-engine/library/distributions.ts:271–271

(a: Expression, b: Expression)

 *   `−2.7·10^45`, `−8.8·10^4346`, `−3.0·10^434300`; `n = 3` gives
 *   `+1.3·10^47`, `+4.4·10^4350`, `+1.5·10^434306`; `n = 4` gives
 *   `−4.3·10^48`, `−1.5·10^4354`, `−5.1·10^434311`.
 * - `Q(a, −∞) = 0` for a NON-POSITIVE integer `a`, where `1/Γ(a)` vanishes:
 *   the finite branch gives `Q(a, z) = 0` at every nonzero `z` there, so the
 *   limit is `0` too.