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R={,,},S={,,},请求出R∪S,R∩S,R-S,dom(R),ran(R),dom(R-S),ran(R-S),R^-1,R.S,S.R,R^2

题目详情
R={,,},S={,,},请求出R∪S,R∩S,R-S,dom(R),ran(R),dom(R-S),ran(R-S),R^-1,R.S,S.R,R^2
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答案和解析
  R∪S = {,,,,}  R∩S = {}  R-S = {,}  dom(R) = {2,3}  ran(R) = {2,3,4}  dom(R-S) = {2,3}  ran(R-S) = {2,3}  R^-1 = {,,}  R.S = {,}  S.R = {,,}  R^2 = {,,}...