Relations -- Proof Writing 16

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Talk bout the more general idea a relation is subset of AxB where A and B are sets .
You should talk about this in the start

aashsyed
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T=18min. Transitivity of "not equal". The example given shows xRy ^ yRx => xRx, rather than xRz (or "not xRz"). Is it allowable for x=z in the definition of transitivity?

mattwoodphd
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For the divisability, isn't it not reflexive in the integers? because 0 does not divide 0?

nevolevy