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  2. Mutual exclusivity - Wikipedia

    en.wikipedia.org/wiki/Mutual_exclusivity

    In logic, two propositions and are mutually exclusive if it is not logically possible for them to be true at the same time; that is, () is a tautology. To say that more than two propositions are mutually exclusive, depending on the context, means either 1. "() () is a tautology" (it is not logically possible for more than one proposition to be true) or 2. "() is a tautology" (it is not ...

  3. Collectively exhaustive events - Wikipedia

    en.wikipedia.org/wiki/Collectively_exhaustive_events

    where S is the sample space. Compare this to the concept of a set of mutually exclusive events. In such a set no more than one event can occur at a given time. (In some forms of mutual exclusion only one event can ever occur.) The set of all possible die rolls is both mutually exclusive and collectively exhaustive (i.e., "MECE"). The events 1 ...

  4. Law of excluded middle - Wikipedia

    en.wikipedia.org/wiki/Law_of_excluded_middle

    In logic, the law of excluded middle or the principle of excluded middle states that for every proposition, either this proposition or its negation is true. [1] [2] It is one of the three laws of thought, along with the law of noncontradiction, and the law of identity; however, no system of logic is built on just these laws, and none of these laws provides inference rules, such as modus ponens ...

  5. MECE principle - Wikipedia

    en.wikipedia.org/wiki/MECE_principle

    Examples of MECE arrangements include categorizing people by year of birth (assuming all years are known), apartments by their building number, letters by postmark, and dice rolls. A non-MECE example would be categorization by nationality, because nationalities are neither mutually exclusive (some people have dual nationality) nor collectively ...

  6. Rule of mutual exclusion - Wikipedia

    en.wikipedia.org/wiki/Rule_of_mutual_exclusion

    The rule of mutual exclusion in molecular spectroscopy relates the observation of molecular vibrations to molecular symmetry. It states that no normal modes can be both Infrared and Raman active in a molecule that possesses a center of symmetry .

  7. Mutual exclusivity (psychology) - Wikipedia

    en.wikipedia.org/wiki/Mutual_exclusivity...

    Mutual exclusivity is a word learning constraint that involves the tendency to assign one label/name, and in turn avoid assigning a second label, to a single object. [1] Mutual exclusivity is often discussed as one of three main lexical constraints, or word learning biases , that are believed to play major roles in word learning, the other two ...

  8. Types of social groups - Wikipedia

    en.wikipedia.org/wiki/Types_of_Social_Groups

    Examples include study groups, sports teams, schoolmates, attorney-client, doctor-patient, coworkers, etc. Cooley had made the distinction between primary and secondary groups, by noting that the term for the latter refers to relationships that generally develop later in life, likely with much less influence on one’s identity than primary groups.

  9. Closure (sociology) - Wikipedia

    en.wikipedia.org/wiki/Closure_(sociology)

    Some examples of social closure include, “Access to private schools follows explicit rules and depends on financial capacities; access to university depends on a certificate or diploma, eventually from certain schools only; membership in a highly prestigious club depends on economic and social capital and the respective social networks; and ...