等价 děngjià equal-value Origin Definitions Defs Strokes Stroke Words Sentences Sents 等价交换 děngjiàjiāohuàn equal exchange equal-value exchange不等价交换 bùděngjiàjiāohuàn unequal exchange exchange of unequal values等价关系 děngjiàguānxì equivalence relation (math.) equivalence relation