Problem on first order deformations of triangles

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http://ift.tt/eA8V8J

Let T⊂R2 T ⊂ R 2 be any triangle and Tt T t a first order deformation of T T . Call l1,l2,l3 l 1 , l 2 , l 3 the squares of the lengths of the sides of T T and ...

from Algebra

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