These are the formulae most worth learning by heart from the book, grouped by chapters and listed by their description rather than by the formulae themselves so the reader can test his or her memorization of them.
De Broglie’s formula relating wavelength and momentum for a particle with mass (Eq. (2.1)).
The time-independent Schrödinger equation (Eq. (2.13)).
The normalization integral for a wavefunction (Eq. (2.20)).
The expression defining orthonormality of functions (Eq. (2.35)).
The expression for the expansion of a function on a basis set of functions (Eq. (