Hobbymath's wanderings #18

Spouge's_approximation (Wiki).

Lanczos_approximation (Wiki).

Proof of the Euler product formula for the Riemann zeta function (Wiki).

Birds and Frogs (Freeman Dyson's article).

Wolstenholme's theorem (Wiki).

Lenstra elliptic curve factorization (Wiki).

Lambert W function (Wiki).

Arithmetic derivative (Wiki).

Cartessian Genetic Programming (pdf).

Cartessian Genetic Programming.

Cartessian Genetic Programming (resources).

Hardy&Littlewood circle method (Wiki).

Dedekind eta function (Wiki).

Modular form (Wiki).

Modular_group (Wiki).

Wallis product (Wiki).

Proof_by_infinite_descent: Irrationality of sqrt(2) (Wiki).