enable them some defaults for multilevel preconditioners may</span>
<span 
class="cmr-12">change to reflect their presence.</span>
<!--l. 102--><p class="indent" >
     <dl class="description"><dt class="description">
<span 
class="cmbx-12">UMFPACK</span> </dt><dd 
class="description">
     <!--l. 103--><p class="noindent" ><span class="cite"><span 
class="cmr-12">[</span><a 
href="userhtmlli5.html#XUMFPACK"><span 
class="cmr-12">16</span></a><span 
class="cmr-12">]</span></span> <span 
class="cmr-12">A spa