we saw that there’s something that’s arguably even more fundamental than our three-dimensional space and the particles within it: the wavefunction and the infinite-dimensional place called Hilbert space where it lives. Whereas particles can be created and destroyed, and can be in several places at once, there is, was and always will be only one wavefunction, moving through Hilbert space as determined by the Schrödinger equation—and the wavefunction and Hilbert space are purely mathematical objects.
