Now I'm even completely loster. Does "x —> 1/x" have anythhing to do with a) "Time reversal / unitarity" or with b) " Henry Baker wrote: ----- "Time reversal / unitarity." ???? Ok, I'm completely lost. What is the physical meaning of x -> 1/x (assuming that it's unique in a non-associative algebra. If not, choose a left or right inverse or.) At 12:31 PM 7/28/2018, Mike Stay wrote:

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"Where does she use *division*?" Time reversal / unitarity.