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Missing exercise solution in 4.12 #12

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SlimTim10 opened this issue Dec 19, 2023 · 0 comments

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SlimTim10 commented Dec 19, 2023

In the last exercise of section 4.12:

Exercise (Trivial) Should the reader be feeling industrious, they
are encouraged to prove that Sandbox-Relations.Unrelated and
Sandbox-Relations.Related are also preorders.

the provided solution does not include the proof for Sandbox-Relations.Unrelated:

Solution

open Sandbox-Relations using (Related; related)
Related-preorder : IsPreorder (Related {A = A})
IsPreorder.refl Related-preorder = related
IsPreorder.trans Related-preorder _ _ = related

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