Kind/book/U60.abs_diff.kind2
2024-03-12 18:01:12 -03:00

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U60.abs_diff
: ∀(a: #U60) ∀(b: #U60) #U60
= λa λb
use P = λx #U60
use true = #(- b a)
use false = #(- a b)
(~(U60.to_bool #(< a b)) P true false)