Are there fundamental limits on the accuracy for measuring both position ##q## at time ##t## and momentum ##p## at time ##t+\Delta t##, with tiny ##\Delta t##?(adsbygoogle = window.adsbygoogle || []).push({});

If yes, why?

If no, why can't one then measure (in principle) both ##q## and ##p## arbitrarily well at the same time ##p## (which is not allowed by Heisenberg's uncertainty relation), by taking ##\Delta t## sufficiently small and noting that any measurement takes time?

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# Featured I On the Heisenberg uncertainty relation

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