In deductive systems with a conditional connective →, a disjunction ∨ and a negation ¬, the axiom scheme:
• (φ→ψ)∨(φ→¬ψ)
i.e., the condition that for any sentences φ and ψ, φ either entails ψ or the negation of ψ.
科学参考收录了60776条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。