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gr-qc1995
Clocks and Time
Arlen Anderson
A general definition of a clock is proposed, and the role of clocks in establishing temporal pre-conditions in quantum mechanical questions is critically discussed. The different s…
gr-qc1995
Evolving Constants of Motion
Arlen Anderson
A critical presentation of Rovelli's ``evolving constants of motion'' is given. Previous criticisms by Kuchař concerning the role of factor ordering and the non-existence of observ…