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<H2><A NAME="SECTION00052000000000000000">
Optional third party libraries</A>
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<P>
We provide interfaces to the following third-party software libraries;
note that these are optional, but if you enable them some defaults
for multilevel preconditioners may change to reflect their presence. 

<P>
<DL>
<DT><STRONG>UMFPACK</STRONG></DT>
<DD>[<A
 HREF="node27.html#UMFPACK">9</A>]
  A sparse direct factorization package available from 
<BR>  <code>http://www.cise.ufl.edu/research/sparse/umfpack/</code>; 
  provides serial factorization and triangular system solution for double
  precision real and complex data. We have tested
  versions 5.4. 
</DD>
<DT><STRONG>SuperLU</STRONG></DT>
<DD>[<A
 HREF="node27.html#SUPERLU">11</A>]
  A sparse direct factorization package available from 
<BR>  <code>http://crd.lbl.gov/~xiaoye/SuperLU/</code>; provides serial
  factorization and triangular system solution for single and double precision,
  real and complex data. We have tested version 4.3 and 5.0. 
 
</DD>
<DT><STRONG>SuperLU_Dist</STRONG></DT>
<DD>[<A
 HREF="node27.html#SUPERLUDIST">21</A>]
   A sparse direct factorization package available
   from the same site as SuperLU; provides parallel factorization and
   triangular system solution for double precision real and complex data.
   We have tested version 3.3 and 4.2.
</DD>
<DT><STRONG>MUMPS</STRONG></DT>
<DD>[<A
 HREF="node27.html#MUMPS">10</A>]
  MUMPS (“MUltifrontal Massively Parallel Solver”) is a sparse, direct factorization 
  package available from 
<BR>  <code>http://mumps.enseeiht.fr/</code>.
  It implements a direct method based on a multifrontal approach which performs 
  a Gaussian factorization. 
  We have tested versions 4.10.0 and version 5.0.1.  

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