The disappointment logic is understood in more than one way. In general, this ratio is used as a synonym of incompatibility and is one of the best known logical relationships.
In propositional logic and classical logic means the incompatibility as a relationship between two propositional forms that they can not be both simultaneously true .
For example, on one hand and q-q Ypy other are contrary to or inconsistent, since both p and q are true or false there will never be a substitution in which both are true.
can also understand the disappointment from meaning of sentences. For example, if we have the words "today is Tuesday" and "Today is Thursday," both can not be true simultaneously, by virtue of its meaning. There will be days when one is true, but not another.
The Saturday will be both false, so that on that day are both false simultaneously.
However, to talk about the falsity of the two forms simultaneously up propositional should say that they are in the event that both p and q are false.
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