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A Neighborhood of Infinity[^]:
Being compatible with Heisenberg uncertainty isn't enough for something to be realisable as a physical state. Is there a wavefunction that allows us to know the digits to the right of the decimal point as far as we want for both position and momentum measurements? Maybe surprisingly, the worlds of audio and graphics can help us answer this question.

The Dirac comb is an example of a wavefunction whose position and momentum aren't fuzzy.

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