Propositional logic is a special case of FOPL. It is simple to deal with and a decision procedure exists for it. We can easily represent real world facts as logical propositions. Propositions are elementary atomic sentences, written as formula or well formed formulas (wffs). Propositions may either be true or false . some examples of simple propositions are
it is raining
snow is white
people live on moon
Compound Propositions are formed from wffs using logical connectives “ not, and or , if …then (implication) and if … and only if”. For example :it is raining and wind is blowing” is a compound proposition.
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