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. 


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