Mathematical logic: propositional logic basic concept propositional logic equivalence calculus propositional logical reasoning theory first-order logic basic concept first-order logical equivalence calculus and Inference theory
Proposition: A statement that can judge the truth or falsehood. (exclamation, question, qi make a sentence is not a proposition)
Propositions are divided into simple propositions and compound propositions.
Simple proposition symbolization: p,q,r with lowercase english letters, ... Represents a simple proposition. (2) Use "1" to express true, with "0" for false
Negation: No, no, no, no.
Hop ∧: And, at the same time, and, both ... And ..., not only ... And ..., though ... But....
Disjunction ∨: Or, perhaps, possibly.
Implication →: if ... Then ..., if ... So ..., since ... So ..., if ... Just ..., as long as ... It's just that ... Just, ....
Equivalent to ←: When and only if, fully necessary, same, same, ....
A tautology (also known as a perpetual) value is true under various assignments.
Contradictions (also known as the permanent Pseudo-type) under various assignment values are false.
A satisfying formula (not an oxymoron).
Basic equivalents:
Basic tautology Implication type:
Mastered these basic things in the continuous consolidation lay a good foundation.
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