From: Tao Jin <taojin83@gmail.com>
Date: Wed, 23 Aug 2023 02:21:34 +0000 (-0400)
Subject: add an entry in changelog
X-Git-Tag: relicensing~341^2~2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35c21395e3b8dad6b4d476fb290326ad2d26891b;p=dealii.git

add an entry in changelog
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diff --git a/doc/news/changes/minor/20230822TaoJin b/doc/news/changes/minor/20230822TaoJin
new file mode 100644
index 0000000000..3bd6f7aa50
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+++ b/doc/news/changes/minor/20230822TaoJin
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+New: Add two tensor functions for the split of a 2nd-order symmetric tensor
+into a positive part and a negative part based on the signs of the eigenvalues
+obtained from the spectrum decomposition. The function positive_negative_split()
+performs the positive-negative split of the 2nd-order symmetric tensor given as 
+the input. The function positive_negative_projectors() not only performs the split,
+but also provides the derivatives (two fourth-order tensors) of the positive/negative 
+part of the tensor with respect to the input tensor.
+<br>
+(Tao Jin, 2023/08/22)