= Effective collapse in Bohmian mechanics
If total-wave branches become disjoint in the relevant environment configuration variables and the actual environment lies within one branch, the subsystem's <conditional wave function> is proportional to that branch's subsystem factor. Persistent separation makes its autonomous use an effective description. No term of the universal <wave function> has literally been deleted. Possible recombination prevents treating every temporary packet separation as irreversible collapse.<Quantum Equilibrium and the Role of Operators as Observables in Quantum Theory by Detlef Dürr and others>[sections 2.2–2.3]{ref}
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