There are many interpretative problems, which are to be found in the domain of quantum mechanics, but the measurement problem is one of the most troublesome. According to the standard formulation of this theory, an observer is needed to cause a collapse of the wave function of any isolated quantum system. But in the case of the Universe - the possible largest isolated quantum system - there is no external observer that could be responsible for such a collapse. An interpretation of quantum theory, which solves this difficulty, is the so called Many Worlds Theory, originally credited to Hugh Everett. This paper presents some main ideas of this theory and compares its qualities and faults.
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