The Pi Approximation Day is celebrated on July 22 as the date 22/7 marks the approximate value of Pi (22.7). However, Pi day is celebrated on March 14, as the date marks the actual value of Pi - 3.14.

S. Das, H. Dutta, Degree of approximation of signals in certain Lipschitz classes by the Zweier–Euler product summability method of Fourier series, Math. Methods ...

This paper provides an error analysis for the Crank-Nicolson method of time discretization applied to spatially discrete Galerkin approximations of the nonstationary ...