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What does the letter "M" in the famous M-theory mean?

Molecule

Matter

Membrane

not known

Modern attempts to formulate M-theory are typically based on matrix theory or the AdS/CFT correspondence. According to Witten, M should stand for “magic”, “mystery”, or “membrane” according to taste, and the true meaning of the title should be decided when a more fundamental formulation of the theory is known.

Ts

4

Marco Nürnberger wikipedia → M-theory

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