I recently read Max Tegmark's book Our Mathematical Universe. In Our Mathematical Universe, Tegmark asserts that Niels Bohr and other scientists supported the Copenhagen Interpretation that the wavefunction collapses. Tegmark asserts that Hugh Everett originated the competing thesis that the wavefunction never collapses. I don't know what the word collapse means in this context. It's my understanding that the wave function is purely a mathematical object, not something physical. So how...