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  2. English modal auxiliary verbs - Wikipedia

    en.wikipedia.org/wiki/English_modal_auxiliary_verbs

    The English modal auxiliary verbs are a subset of the English auxiliary verbs used mostly to express modality, properties such as possibility and obligation. [a] They can most easily be distinguished from other verbs by their defectiveness (they do not have participles or plain forms [b]) and by their lack of the ending ‑(e)s for the third-person singular.

  3. Modal verb - Wikipedia

    en.wikipedia.org/wiki/Modal_verb

    could: That could happen soon. – He could swim when he was young. may: That may be a problem. May I stay? – might: The weather might improve. Might I help you? – must: It must be hot outside. Sam must go to school. – shall: This shall not be viewed kindly. You shall not pass. – should: That should be surprising. You should stop that ...

  4. Mathematical fallacy - Wikipedia

    en.wikipedia.org/wiki/Mathematical_fallacy

    In mathematics, certain kinds of mistaken proof are often exhibited, and sometimes collected, as illustrations of a concept called mathematical fallacy.There is a distinction between a simple mistake and a mathematical fallacy in a proof, in that a mistake in a proof leads to an invalid proof while in the best-known examples of mathematical fallacies there is some element of concealment or ...

  5. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For instance, the first counterexample must be odd because f(2n) = n, smaller than 2n; and it must be 3 mod 4 because f 2 (4n + 1) = 3n + 1, smaller than 4n + 1. For each starting value a which is not a counterexample to the Collatz conjecture, there is a k for which such an inequality holds, so checking the Collatz conjecture for one starting ...

  6. Mathematical proof - Wikipedia

    en.wikipedia.org/wiki/Mathematical_proof

    That is, a 2 is even, which implies that a must also be even, as seen in the proposition above (in #Proof by contraposition). So we can write a = 2c, where c is also an integer. Substitution into the original equation yields 2b 2 = (2c) 2 = 4c 2. Dividing both sides by 2 yields b 2 = 2c 2. But then, by the same argument as before, 2 divides b 2 ...

  7. The 6 best and 6 worst celebrity Christmas albums - AOL

    www.aol.com/6-best-6-worst-celebrity-192259339.html

    The star, of course, is "All I Want for Christmas is You," which is so timeless that it hit No. 1 on the Billboard Hot 100 a full 25 years after its release, and has continued to top the chart ...

  8. The A's clear the last major hurdle for a $1.75 billion Las ...

    www.aol.com/expected-clear-last-major-hurdle...

    The Las Vegas Stadium Authority approved lease, non-relocation and development documents Thursday to clear the last major hurdles for the Athletics to construct a $1.75 billion stadium on the ...

  9. Principia Mathematica - Wikipedia

    en.wikipedia.org/wiki/Principia_Mathematica

    It is to be regretted that this first comprehensive and thorough-going presentation of a mathematical logic and the derivation of mathematics from it [is] so greatly lacking in formal precision in the foundations (contained in 1– 21 of Principia [i.e., sections 1– 5 (propositional logic), 8–14 (predicate logic with identity/equality), 20 ...

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