From: "James N Rose"
> "Conservation" as a 'fundamental rule of condition'
> is incompatible and antithetical with any notions
> of "many worlds".
Are conservation principles only defined in
closed systems? Is a 'world' a closed system?
There is, i.e., a no-deleting theorem (similar
to the no-cloning theorem) saying that given
2 qubits in unknown and equal states, one
cannot take one of them to a fixed state,
keeping the other in the original state.
In other terms |psi>|psi> --> |psi>|0>
is forbidden. But, of course, it is possible
to delete a quantum state by trowing it out
of that system, out of that world.