[isabelle] new AFP entry: General-Triangle

A new AFP entry is available at [http://afp.sourceforge.net/entries/General-Triangle.shtml]:

The General Triangle Is Unique
by Joachim Breitner

Some acute-angled triangles are special, e.g. right-angled or isoscele triangles. Some are not of this kind, but, without measuring angles, look as if they were. In that sense, there is exactly one general triangle. This well-known fact is proven here formally.

Date: 2011-04-01


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