Fill out the LinearOperator paragraph.

diff --git a/9.0/paper.tex b/9.0/paper.tex
index 7419fb6687a64a573a24dfbcf669aac632c352f4..2904349a8f4299b7499223d402268df97c7349dc 100644 (file)
--- a/9.0/paper.tex
+++ b/9.0/paper.tex
@@ -162,8 +162,12 @@ The major changes of this release are:
   now being used to ensure the quality of the code.
 
 \item
-  Improved support for LinearOperator (Trilinos payload, Schur complement,
-  iterative inverse), removal of old wrapper classes
+  \texttt{LinearOperator}, a flexible template class that implements the action of a
+  linear operator (see \cite{MaierBardelloniHeltai-2016-b}), now supports
+  computations with Trilinos, Schur complements, and linear constraints. This
+  class is, as of this release, the official replacement for about half a dozen
+  similar (but less general) classes, such as \texttt{FilteredMatrix},
+  \texttt{IterativeInverse}, and \texttt{PointerMatrix}.
 
 \item
   Significant extension of matrix-free capabilities, including support for face integrals in discontinuous Galerkin schemes, a new Hermite-like polynomial basis adapted to face integrals that involve derivatives of shape functions, and several performance enhancements