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<HTML>
<HEAD>
<TITLE>Bessel functions</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF" fgcolor="#000000">
<P><A NAME="bessel"></A>
<font size="+3" color="green"><B>Bessel functions</B></font></P>
<P>
<TABLE border="1" cols="2" frame="box" rules="all" width="572">
<TR>
<TD width="15%" valign="top"><B>Syntax</B>:</TD>
<TD width="85%"><CODE>
y = BESJ0(x)<br />
y = BESJ1(x)<br />
y = BESY0(x)<BR />
y = BESY1(x)<br />
y = BESI0(x)<br />
y = BESI1(x)<br />
y = BESK0(x)<br />
y = BESK1(x)</CODE>
</TD></TR>
</table></p>
<P>
The Bessel functions of the first and second kinds, <i>J<sub>n</sub></i>
and <i>Y<sub>n</sub></i> , are
linearly independent solutions to the differential equation</P>
<P>
<center><IMG WIDTH="271" HEIGHT="50" ALIGN="BOTTOM" SRC="bessel1.gif"></center></P>
<p>
Bessel functions arise in solving differential equations for systems with
cylindrical symmetry.</P>
<P><center>
<IMG WIDTH="345" HEIGHT="50" SRC="besj0.gif"></P>
<P>
<IMG WIDTH="388" HEIGHT="50" SRC="besj1.gif"></P>
<P>
<IMG WIDTH="470" HEIGHT="170" SRC="besy0.gif"></P>
<P>
<IMG WIDTH="595" HEIGHT="80" SRC="besy1.gif"></P></center>
<P>
The modified Bessel functions of the first and second kinds,
<i>I<sub>n</sub></i> and <i>K<sub>n</sub></i>, are solutions to the
differential equation</P>
<P><center>
<IMG SRC="bessel2.gif"></center></P>
<P>
<IMG SRC="besi0.gif"></P>
<P>
<IMG SRC="besi1.gif"></P>
<P>
<IMG SRC="besk0.gif"></P>
<P>
<IMG SRC="besk1.gif"></P>
<P>
where <img src="psi.gif"> is the Psi function
(also known as the DiGamma function), and where
<img src="gamma.gif"> is Euler's constant</P>
<P>
<center><IMG SRC="euler.gif"></center></P>
<P>
<a href="../Area/area.htm"><img align="top" border="0" src="../../../shadow_left.gif">
<font size="+1" color="olive">Area function</font></a><br />
<a href="../Beta/beta.htm"><img align="top" border="0" src="../../../shadow_right.gif">
<font size="+1" color="olive">Beta function</font></a>
</P>
</BODY>
</HTML>
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