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 Exercise Eight: 8.1 - 8.2
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Exercise 8.2 - Answers

 

1

(i)

This is an equivalence relation. The equivalence classes are the six crews and each has nine members.

 
(ii)

This is not an equivalence relation. It is neither reflexive nor transitive.

 
(iii)

This is an equivalence relation. There are nine equivalence classes, corresponding to the nine positions in an eight, and each class has six members.

 
(iv)

This is an equivalence relation. There is just one equivalence class, with 54 members.

 

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