2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89259We will describe how a new, quite simple, but highly effective algorithm, together with the asymptotically fast FFT-based high-precision number multiplication of Mathematica 4 can calculate the ground state of the x^4 anharmonic oscillator to the new record of more than 1000 digits.Quantum Physicstext