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Jul 28, 2016 at 15:00 vote accept saldenisov
Nov 5, 2014 at 13:07 comment added saldenisov @tschoppi exactly. I was surprised when I saw that. It looks that some researchers does not understand something or what it is more likely, that I do not understand something.
Nov 4, 2014 at 22:42 comment added tschoppi Actually, both expressions are then not identical. There is a minus sign missing in the second one.
Nov 4, 2014 at 22:22 history edited Klaus-Dieter Warzecha CC BY-SA 3.0
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Nov 4, 2014 at 22:14 history answered Klaus-Dieter Warzecha CC BY-SA 3.0