Questions pertaining to logical constructs

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Logical meaning of “within 30 days” compared to “in 30 or fewer days” or “fewer than 30 days”

As I understand it, the phrase "within 30 days" is the same as "in 30 or fewer days" not "fewer than 30 days." Is this correct? (I've chosen fewer instead of less because days are a quantity that ...
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Why is “all . . . not” apparently more common than “not all ”?

For example, All that glitters is not gold is sort of a fixed term, and people often use the same “all . . . not” form when talking about things. See also the question “Is it wrong to use ‘not’ in ...
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True opposite of Tacit, Explicit and Implicit knowledge?

In searching for the alternatives to explicit knowledge, I've been given two answers: implicit and tacit. While I can understand how both of these answers are true (and that implicit and tacit have ...
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A word or term for extrapolation fallacy or using results beyond their context? [Solved]

I am looking for a word or term that means something like: you are using previous results outside boundaries of the original experiment/observation earlier experience/results does not apply in all ...