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Logical disjunction
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==Notes== {{Notelist}} * [[George Boole]], closely following analogy with ordinary mathematics, premised, as a necessary condition to the definition of x + y, that x and y were mutually exclusive. [[William Stanley Jevons|Jevons]], and practically all mathematical logicians after him, advocated, on various grounds, the definition of ''logical addition'' in a form that does not necessitate mutual exclusiveness.
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