By describing electrons not as traveling particles but as propagating waves of probability, the Schrödinger equation predicts that, much like interfering waves on a lake, fragments of an electron’s wave function coming out of different slits will intermingle, yielding a pattern of high and low probabilities for where on the screen each individual electron will land. Where the wave fragments emerging from both slits arrive in step with each other, they will reinforce; where they arrive out of step, they will cancel.
