Question about the Many-Worlds Interpretation

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In traditional collapse interpretations, energy is conserved only in schrödinger equation evolution, not whille collapse. THere is no advantage in this aspect in traditional interpretations over many worlds. PD: I don´t want in many world, because Everett worlds: worlds where you meet the "quantum coin" 100 of 100 times in face. Maybe the proportionality constant between entropy (exponential) and number of worlds be t.q when there are a improper fraction of worlds with this chance this world doesn´t exist. But this is contrary to the interpretation of exponential of entropy like 2 times the error around the average value of random variable of the experiment result. Bhobba, many worlds doesn´t refere to decohered subsystems. All the universe detectable is a world in MWI. MWI have very difficulties but decoherence well, it explains very well why the Weightman Friend doesn´t see two observers with two cats, one alive and one dead, in superposition, but the thing that a subsystem decohere while the complete system is in entanglament.It doesn´t explain why we perceive only the decohered subsystem
 

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