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  2. Necessary and Proper Clause - Wikipedia

    en.wikipedia.org/wiki/Necessary_and_Proper_Clause

    The Necessary and Proper Clause, also known as the Elastic Clause, [1] is a clause in Article I, Section 8 of the United States Constitution: The Congress shall have Power... To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government ...

  3. Sine qua non - Wikipedia

    en.wikipedia.org/wiki/Sine_qua_non

    A sine qua non (/ ˌ s aɪ n i k w eɪ ˈ n ɒ n, ˌ s ɪ n i k w ɑː ˈ n oʊ n /, [1] Latin: [ˈsɪnɛ kʷaː ˈnoːn]) or conditio sine qua non (plural: conditiones sine quibus non) is an indispensable and essential action, condition, or ingredient.

  4. If and only if - Wikipedia

    en.wikipedia.org/wiki/If_and_only_if

    In writing, phrases commonly used as alternatives to P "if and only if" Q include: Q is necessary and sufficient for P, for P it is necessary and sufficient that Q, P is equivalent (or materially equivalent) to Q (compare with material implication), P precisely if Q, P precisely (or exactly) when Q, P exactly in case Q, and P just in case Q. [3]

  5. Rerum novarum - Wikipedia

    en.wikipedia.org/wiki/Rerum_novarum

    Private ownership, as we have seen, is the natural right of man, and to exercise that right, especially as members of society, is not only lawful, but absolutely necessary. "It is lawful," says St. Thomas Aquinas, "for a man to hold private property; and it is also necessary for the carrying on of human existence." [22]

  6. Article 2 of the European Convention on Human Rights

    en.wikipedia.org/wiki/Article_2_of_the_European...

    The use of force must be absolutely necessary; It must be in defence of a third party; It must be subject to a proper and effective investigation which is both impartial and independent. Key rulings in this matter are McCann and Others v United Kingdom, [1] Makaratzis v Greece, [11] and Nachova and others v Bulgaria. [28]

  7. Terminology - Wikipedia

    en.wikipedia.org/wiki/Terminology

    Terminology is a group of specialized words and respective meanings in a particular field, and also the study of such terms and their use; [1] the latter meaning is also known as terminology science. A term is a word, compound word , or multi-word expression that in specific contexts is given specific meanings—these may deviate from the ...

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  9. Necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Necessity_and_sufficiency

    A number's being divisible by 4 is sufficient (but not necessary) for it to be even, but being divisible by 2 is both sufficient and necessary for it to be even. Example 3 An occurrence of thunder is a sufficient condition for the occurrence of lightning in the sense that hearing thunder, and unambiguously recognizing it as such, justifies ...