  In this note, we discuss a historical point regarding Schr\"odinger's
discovery of the famous quantum wave equation in 1926 following de Broglie's
fundamental works published in 1923-1925 regarding the introduction of matter
waves. Drawing on the work of historians and personal analysis, we show that de
Broglie was very close to the discovery of the Schr\"odinger equation (at least
for the stationary one-electron problem).
