From af4e1d3f5f8c7bb1555f8f47e2772bf46573939d Mon Sep 17 00:00:00 2001
From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Tue, 11 Jul 2017 08:42:15 +0200
Subject: [PATCH] Add changelog

---
 doc/news/changes/major/20170711MartinKronbichler-b | 6 ++++++
 doc/news/changes/minor/20170711MartinKronbichler   | 9 +++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 doc/news/changes/major/20170711MartinKronbichler-b
 create mode 100644 doc/news/changes/minor/20170711MartinKronbichler

diff --git a/doc/news/changes/major/20170711MartinKronbichler-b b/doc/news/changes/major/20170711MartinKronbichler-b
new file mode 100644
index 0000000000..91cacbff77
--- /dev/null
+++ b/doc/news/changes/major/20170711MartinKronbichler-b
@@ -0,0 +1,6 @@
+Improved: The constructor of MappingQGeneric used a naive inversion of a cell
+Poisson matrix, which became very slow for high approximation degrees in
+3D. The implementation has been switched to the fast diagonalization method
+implemented by TensorProductMatrixSymmetricSum.
+<br>
+(Martin Kronbichler, 2017/07/11)
diff --git a/doc/news/changes/minor/20170711MartinKronbichler b/doc/news/changes/minor/20170711MartinKronbichler
new file mode 100644
index 0000000000..011d5d911a
--- /dev/null
+++ b/doc/news/changes/minor/20170711MartinKronbichler
@@ -0,0 +1,9 @@
+New: A new class TensorProductMatrixSymmetricSum that represents a tensor
+product of a mass and derivative matrix has been added. It implements both the
+matrix-vector operation (TensorProductMatrixSymmetricSum::vmult()) as well as
+the inverse operation (TensorProductMatrixSymmetricSum::apply_inverse())
+operation in tensorial form with optimal complexity of
+<tt>size<sup>dim+1</sup></tt> operations. The inverse operation uses the fast
+diagonalization method.
+<br>
+(Martin Kronbichler, 2017/07/11)
-- 
2.39.5