| 单词 | symmetrical difference | 
| 释义 | > as lemmassymmetrical difference  d.  Mathematics and Logic.  symmetrical difference = symmetric difference n. at symmetric adj. Compounds. ΘΚΠ the mind > mental capacity > philosophy > logic > predicate or propositional logic > 			[noun]		 > set theory or extension > symmetric group or difference symmetric group1897 symmetric difference1936 symmetrical difference1978 the world > relative properties > number > mathematical number or quantity > numerical arrangement > 			[noun]		 > set > elements in or parts of > relation between well-ordering1914 symmetric difference1936 partial ordering1938 equivalence relation1940 symmetrical difference1978 1978    C. H. Greenstein Dict. Logical Terms & Symbols 172  				Symmetrical difference. 1979    Kandel  & Lee Fuzzy Switching & Automata ii. 53  				The symmetrical difference (or Boolean sum) of two fuzzy sets. < as lemmas  | 
	
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