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  2. Affirmation and negation - Wikipedia

    en.wikipedia.org/wiki/Affirmation_and_negation

    Affirmation can be indicated with the following words in English: some, certainly, already, and would rather. [4] Two examples of affirmation include (1) John is here already [4] and (2) I am a moral person. [5] These two sentences are truth statements, and serve as a representation of affirmation in English.

  3. Conversion (word formation) - Wikipedia

    en.wikipedia.org/wiki/Conversion_(word_formation)

    In English, verbification typically involves simple conversion of a non-verb to a verb. The verbs to verbify and to verb, the first by derivation with an affix and the second by zero derivation, are themselves products of verbification (see autological word), and, as might be guessed, the term to verb is often used more specifically, to refer only to verbification that does not involve a ...

  4. English verbs - Wikipedia

    en.wikipedia.org/wiki/English_verbs

    The base form or plain form of an English verb is not marked by any inflectional ending.. Certain derivational suffixes are frequently used to form verbs, such as -en (sharpen), -ate (formulate), -fy (electrify), and -ise/ize (realise/realize), but verbs with those suffixes are nonetheless considered to be base-form verbs.

  5. Morphological derivation - Wikipedia

    en.wikipedia.org/wiki/Morphological_derivation

    For example, the negating prefix un-is more productive in English than the alternative in-; both of them occur in established words (such as unusual and inaccessible), but faced with a new word which does not have an established negation, a native speaker is more likely to create a novel form with un-than with in-. The same thing happens with ...

  6. Contraposition - Wikipedia

    en.wikipedia.org/wiki/Contraposition

    This results in two contrapositives, one where the predicate term is distributed, and another where the predicate term is undistributed. [10] Contraposition is a type of immediate inference in which from a given categorical proposition another categorical proposition is inferred which has as its subject the contradictory of the original ...

  7. Subject–auxiliary inversion - Wikipedia

    en.wikipedia.org/wiki/Subject–auxiliary_inversion

    Subject–auxiliary inversion (SAI; also called subject–operator inversion) is a frequently occurring type of inversion in the English language whereby a finite auxiliary verb – taken here to include finite forms of the copula be – appears to "invert" (change places) with the subject. [1]

  8. Boolean satisfiability problem - Wikipedia

    en.wikipedia.org/wiki/Boolean_satisfiability_problem

    Formally, a one-in-three 3-SAT problem is given as a generalized conjunctive normal form with all generalized clauses using a ternary operator R that is TRUE just if exactly one of its arguments is. When all literals of a one-in-three 3-SAT formula are positive, the satisfiability problem is called one-in-three positive 3-SAT.

  9. Mathematical induction - Wikipedia

    en.wikipedia.org/wiki/Mathematical_induction

    Another variant, called complete induction, course of values induction or strong induction (in contrast to which the basic form of induction is sometimes known as weak induction), makes the induction step easier to prove by using a stronger hypothesis: one proves the statement (+) under the assumption that () holds for all natural numbers less ...