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gionavisi
.amico.

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Question se e solo se

qualcuno sa dirmi come si trasforma in forma normale il se e solo se??

<-->

:?

19-09-2011 15:51
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gionavisi
.amico.

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se ho A <--> B lo posso scrivere come A --> B and B-->A ?

19-09-2011 16:04
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Rocky
.arcimaestro.

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Dalla dispensa del prof. Ghilardi:

A↔B
sta per
(A → B) ∧ (B → A):
il connettivo

si chiama `bi-implicazione' o
`equivalenza materiale'. Si potrebbero in realtà eliminare altri connettivi dalla lista
dei connettivi primitivi e introdurli come abbreviazioni, la scelta che abbiamo fatto
non è minimale in questo senso.

20-09-2011 01:34
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gionavisi
.amico.

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grazie mille per la risposta!!!:-D:D

20-09-2011 17:15
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