.TH BESSEL 3M .CT 2 math .SH NAME besj0, besj1, besjn, besy0, besy1, besyn \(mi bessel functions .SH SYNOPSIS .nf .B #include <math.h> .PP .B double besj0(x) .B double x; .PP .B double besj1(x) .B double x; .PP .B double besjn(n, x) .B double x; .PP .B double besy0(x) .B double x; .PP .B double besy1(x) .B double x; .PP .B double besyn(n, x) .B double x; .fi .SH DESCRIPTION These functions calculate Bessel functions of the first and second kinds for real arguments and integer orders. .SH DIAGNOSTICS Negative arguments cause .I besy0, besy1, and .I besyn to return a huge negative value and set .I errno to .BR EDOM .