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Fixup the documentation.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!--Converted with LaTeX2HTML 2017.2 (Released Jan 23, 2017) -->
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<!--Converted with LaTeX2HTML 2018 (Released Feb 1, 2018) -->
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<HTML>
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<HEAD>
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<TITLE>Multigrid Background</TITLE>
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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<META NAME="Generator" CONTENT="LaTeX2HTML v2017.2">
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<META NAME="Generator" CONTENT="LaTeX2HTML v2018">
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<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
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<LINK REL="STYLESHEET" HREF="userhtml.css">
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@@ -88,19 +88,19 @@ are considered. The second approach performs a fully automatic coarsening and en
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interplay between fine and coarse level by suitably choosing the coarse space and
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the coarse-to-fine interpolation (see, e.g., [<A
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HREF="node36.html#Briggs2000">3</A>,<A
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HREF="node36.html#Stuben_01">23</A>,<A
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HREF="node36.html#dd2_96">21</A>] for details.)
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HREF="node36.html#Stuben_01">24</A>,<A
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HREF="node36.html#dd2_96">22</A>] for details.)
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</BIG></BIG></BIG>
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<P>
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<BIG CLASS="LARGE"><BIG CLASS="LARGE"><BIG CLASS="LARGE">MLD2P4 uses a pure algebraic approach, based on the smoothed
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aggregation algorithm [<A
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HREF="node36.html#BREZINA_VANEK">2</A>,<A
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HREF="node36.html#VANEK_MANDEL_BREZINA">25</A>],
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HREF="node36.html#VANEK_MANDEL_BREZINA">26</A>],
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for building the sequence of coarse matrices and transfer operators,
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starting from the original one.
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A decoupled version of this algorithm is implemented, where the smoothed
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aggregation is applied locally to each submatrix [<A
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HREF="node36.html#TUMINARO_TONG">24</A>].
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HREF="node36.html#TUMINARO_TONG">25</A>].
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A brief description of the AMG preconditioners implemented in MLD2P4 is given in
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Sections <A HREF="node13.html#sec:multilevel">4.1</A>-<A HREF="node15.html#sec:smoothers">4.3</A>. For further details the reader
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is referred to [<A
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