This mathematician proved that the Riemann zeta function of s equals the product over all primes p (20[1])of the reciprocal of one minus p (20[1])to the negative s in his “product formula.” This mathematician worked 2,000 years after the other namesake of a theorem (20[1]0[1])that establishes (20[1]0[1])a one-to-one (20[1])correspondence (20[2])between even perfect numbers and Mersenne (20[1])primes. (0[1])This mathematician found that the Riemann zeta function of (*) two (0[1])equals pi (10[1])squared over six, (10[2])thus solving (10[1])the Basel problem. (10[3])This mathematician found that (10[1])the number of vertices minus edges (10[2])plus (10[2])faces (10[3])for all (10[1])convex polyhedra (0[1])equals (10[1])two, which is his “characteristic.” (10[1])For 10 (10[1])points, (10[1])name this mathematician whose “number” is the base of the natural (10[1])logarithm, (10[1])denoted (10[1])e. (10[1])■END■ (10[2])