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In page A New Kind of Science:

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Nobel laureate Gerard 't Hooft has more recently also suggested a cellular automaton-based unifying theory of quantum gravity as an interpretation of superstring theory where the evolution equations are classical, "[b]oth the bosonic string theory and superstring theory can be reformulated in terms of a special basis of states, defined on a space-time lattice with lattice length 2 π α . {\displaystyle 2\pi {\sqrt {\alpha '.}}} "[3]