The property of a deductive system L holding when there exists a non-trivial L-theory, i.e., there exists some formula that is not a theorem of L. This property is satisfied by all deductive systems except the trivial logic.
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。