The two well-known theorems considered here are illustrated, for instance, in [2], each with a selected proof;
see [2, p.45, Theorem 2.81] for the butterfly theorem and [2, p.5, Theorem 1.22] for Ceva’s theorem.
In [1] about twenty different proofs of the butterfly theorem are described, with comments on their features,
related references and historical information
The two well-known theorems considered here are illustrated, for instance, in [2], each with a selected proof; see [2, p.45, Theorem 2.81] for the butterfly theorem and [2, p.5, Theorem 1.22] for Ceva’s theorem. In [1] about twenty different proofs of the butterfly theorem are described, with comments on their features,related references and historical information
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