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The connectives of logic have significance.
While logic is a formal discipline or science, for example a quantifier of logic predicate or a logical connective such as conjunction have meaning.
For example, if you have p and q, these proposals represent propositional letters which are connected by the English expression "y", and that connective is called conjunction.
What is its significance? This connective says the simultaneous occurrence of these two parts together. In other words, means that p and q are true at the same time, and nothing else.
For example, if you say "it's summer and still not hot", this expression is symbolized in propositional logic as noted above.
In this case, the connective referred to by the word "and" indicates that both occur simultaneously.
For this sentence true has to happen or yes it is true "it is summer" and be true "does not yet heat. "Otherwise the sentence is false.
This captures precisely the meaning of the connective , it signals that link the two atomic propositions thus can only be true if the expression pointed .