he first being the
  eigenvalues of the square matrix <tt>a</tt>, and the second being their
  respective multiplicities.</dd>
 <dt><b><tt>eigenvectors(a)</tt></b></dt>
	<dd> Does everything that <tt>eigenvalues</tt>
  does, and adds a list of the eigenvectors of <tt>a</tt>.</dd>
 <dt><b><tt>entermatrix(a,b)</tt></b></dt>
	<dd> Cues the user to enter an <tt>a</tt> &times;&nbsp;<tt>b</tt> matrix, element by element.</dd>
 <dt><b><tt>ev(a,b1,b2,...,bn)</tt></b></dt>
	<dd> Evaluates <tt>a</tt> subject to the
 