Chapter 7 Relations : the second time around . Yen-Liang Chen Dept of Information Management National Central University. 7.1. Relations revisited: properties of relations .
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Dept of Information Management
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(A) R is reflexive if and only if InM.
(B) R is symmetric if and only if M=Mtr.
(C) R is transitive if and only if M2M.
(D) R is anti-symmetric if and only if MMtrIn.