(3 marks) (a) Define what it means for a relation R on a set A to be symmetric (b) Let be the relation on R 1 defined by Prove or disprove is symmetric (c) Let be the relation on R defined by xTy Prove or disprove I is symmetric Is y if 0 if x yy (3 marks) (a) Define what it means for a relation R...

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Database management systems

ISBN: 978-0072465631

3rd edition

Authors: Raghu Ramakrishan, Johannes Gehrke, Scott Selikoff

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(3 marks) (a) Define what it means for a relation R on a set A to...

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Database management systems

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