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<DIV>Hilbert space is a MATHEMATICAL concept (<A
title=https://en.wikipedia.org/wiki/Hilbert_space
href="https://en.wikipedia.org/wiki/Hilbert_space">https://en.wikipedia.org/wiki/Hilbert_space</A>).</DIV>
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<DIV>Is there any MEASURE of the proper time ? Thank
you</DIV></DIV></DIV></BODY></HTML>