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I saw the sentence "by the time token" in a physics textbook. The original sentence is:

By the time token, if E < V(and V is constant), then Y is exponential.

In Cambridge Dictionary, "token" means "symbol", but obviously it doesn't suit the context here. Can anyone please explain what the phrase means?

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    Doesn't the book mention such a token earlier in the paragraph or chapter? – Tᴚoɯɐuo Dec 12 '17 at 13:16
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    Difficult to say without more context. It's possible that what they meant to say was by the same token, but just made a mistake and wrote by the time token instead. – Michael Rybkin Dec 12 '17 at 13:27
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    Try checking the index at the back of the textbook, there's a pretty good chance it has one. If you're still struggling, I'll be more than happy to answer. – Tyler Dec 12 '17 at 13:30
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I'm going to go with Cookie Monster on this one and suggest it's a misprint. The common expression is "by the same token", meaning "in the same way".

If I leave my house at 5 in the morning, I can beat the traffic and get to work in half an hour. By the same token if I leave work before 3, I can get home in the same amount of time.

It's possible that "time token" has a specific meaning in the textbook, which would have been earlier defined, but there isn't enough context in your example to be sure.

  • I suspect you are correct. A quick Internet search located this quotation in Introduction to Quantum Mechanics by D.J. Griffiths at the top of page 316. pd.infn.it/~zwirner/WKB-1-2.pdf – joiedevivre Dec 12 '17 at 22:10
  • @joiedevivre Yes, you are correct. I was reading Griffths's Introduction to QM and there's a misprint in my book. Thanks:) – Dennis Dec 13 '17 at 10:45

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