.BR y0 ()
and
.BR y1 ()
-functions return Bessel functions of \fIx\fP
+functions return Bessel functions of
+.I x
of the second kind of orders 0 and 1, respectively.
The
.BR yn ()
function
-returns the Bessel function of \fIx\fP of the second kind of order \fIn\fP.
+returns the Bessel function of
+.I x
+of the second kind of order
+.IR n .
.PP
-The value of \fIx\fP must be positive.
+The value of
+.I x
+must be positive.
.PP
The
.BR y0f ()