MarcumQ
MarcumQ[m, a, b] gives Marcum's Q function Q_m(a, b).
MarcumQ[m, a, b0, b1]gives Marcum's Q function Q_m(a, b0) - Q_m(a, b1).
Examples
MarcumQ[1, 2, 3]MarcumQ[2, 1.5, 0.5, 2.0]Please visit the official Wolfram Language Reference for more details.