| http://www.w3.org/ns/prov#value | - If you need to authoritatively learn what a trivial conservation law means, see e.g. page 4 of math.uwaterloo.ca/~karigian/papers/noether.pdf - ... in the sense that their difference is a trivial conservation law, meaning that either P itself vanishes on the solutions, or dP/dt vanishes identically.
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