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单词 orthonegation
释义
orthonegation

Logic
  • In a deductive system L with conjunction and disjunction connectives and , respectively, a unary connective that is both a De Morgan negation (i.e., is involutive and satisfies De Morgan’s laws) and obeys the principle of explosion.

    • φ,¬φLψ

    It can be inferred from this that orthonegations also satisfy the law of excluded middle:

    • ψLφ¬φ

    Orthonegation arises when negation is given truth conditions in terms of incompatibility (or orthogonality) between states, so that ¬φ is true at a state w precisely when for every state w at which φ is true, w and w are incompatible, i.e., ww.


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