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[" Find the domain and range of "R" an integer "],[" 21.For the relation "R_(1)" defined on "R" by the rule "(a,b)in R_(1)hArr1+ab>0" ."],[" Prove that: "(a,b)in R_(1)" and "(b,c)in R_(1)rArr(a,c)in R_(1)" is not true for all "a,b,c in R" ."]

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