Platonic Solids/Euclidean regular polyhedron? Plato(late 5th to mid 4th century B.C.E) was the first to mention all five convex regular polyhedron in "Timaeus", where he identifies four of them with four of the elements known at the time, and a fifth identified with the "heavens". For this reason, many identify these as Platonic Solids. Euclid (mid 4th to mid 3rd century B.C.E) was the first to prove that only five convex regular polyhedron can exist in the "Elements". This is why The Professor refers to them as Euclid's five regular polyhedron. Euclid's formula does not predict every prime number. 2, 7, 11, 13 etc. are missing. Euclid's formula merely predicts that the answer to this for...