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Michio Kaku, famous theoretical physicist claims to be one of the founders of string field theory and to have contributed a equation that's "no bigger than your thumb" that ties general relativity and quantum field theory together. What is this equation I keep hearing about and why is it important?

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    $\begingroup$ In all fairness, it's cheating. For instance, in GR, use of the metric is used often. This essentially lets you compress the spacetime of a system into a single "matrix" equation. Of course, it really is still one equation, it just keeps a lot of things behind the curtain. $\endgroup$
    – Zach466920
    Commented Mar 3, 2016 at 4:39
  • $\begingroup$ I'm assuming it's an equation ala $E = mc^2$ but I cannot find it on the Internet. $\endgroup$
    – user110164
    Commented Mar 3, 2016 at 4:51
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    $\begingroup$ One shouldn't take everything seriously that Michio Kaku says. This is certainly one of these things that I would just ignore because it's completely meaningless. Even Newtonian mechanics requires a small (roughly 150 page) textbook to develop the core ideas of the theory and it gets exponentially more elaborate from there. $\endgroup$
    – CuriousOne
    Commented Mar 3, 2016 at 5:59

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