3 2 D O C . 3 C O M M E N T O N N O T E B Y S C H R Ö D I N G E R
2. is a variable. Then a differential equation is required which determines as a
function of . That means, one not only has to start out from the hypothesis
of the existence of a nonobservable negative density in the interstellar spaces but
also has to postulate a hypothetical law about the space-time distribution of this
The course taken by Herr Schrödinger does not appear passable to me,
because it leads too deeply into the thicket of hypotheses.