Reverse reconstruction
Encyclopedia
Reverse reconstruction is a technique used to solve geometry
Geometry
Geometry arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre-modern mathematics, the other being the study of numbers ....

problems. The basic structure of such a proof goes as follows: Let the problem be to prove that P implies Q. Then show that Q implies P and that the construction of the original diagram is unique. Thus P implies Q. This method of proof is similar to a proof by contradiction.
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