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Use this tag whenever you have a question about what some particular symbol/notation means.
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What does an = sign with an x beneath it mean?
I am studying for a test in Logic right now, and saw the symbol $\underset{x}{=}$, which is used like this: $I \underset{x}{=} I'$.
I've seen it in the solutions of questions like this one:
Prove …
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Explaining TM notation in Lewis/Papadimitriou
I was working on some questions in the book "Elements Of The Theory Of Computation", by Lewis and Papadimitriou, and I need help with one question - question 4.1.8 (chapter 4):
Give the full detai …