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Status: Closed Points: 75 Time: 14:29 - Aug 31, 2010
doaiv
Cómo se explica la expresión SI y SOLO SI
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gonzalo
Date:: Sep 02, 2010
Time:: 19:10
Eso determina la obligación de que se cumpla el segundo argumento si es que se da el primero. Ej: Llueve si y solo si hay nubes en el cielo. Dado que no puede llover si no hay nubes, si el primer argumento es válido (llueve, mandatorio) entonces por como esta armada la preposición el segundo argumento entonces es verdadero. También vas a encontrar referencias al Modus [ponendo] ponens (http://es.wikipedia.org/wiki/Modus_ponen...) y al Modus [tollendo] tollens (http://es.wikipedia.org/wiki/Modus_tolle...) que explican el uso de eso.
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