English
If a relation on α is well-founded, then its asymmetric₃ form implies not a related to the first via a cycle.
Русский
Если отношение на α хорошо основано, то асимметричный трёхчленный формат исключает циклы.
LaTeX
$$$\\forall {\\alpha} {a b c},\\; r a b \\land r b c \\Rightarrow \\lnot r c a$$$
Lean4
theorem asymmetric₃ {α : Sort*} [WellFoundedRelation α] {a b c : α} :
WellFoundedRelation.rel a b → WellFoundedRelation.rel b c → ¬WellFoundedRelation.rel c a := fun hab hbc hca =>
WellFoundedRelation.asymmetric₃ hca hab hbc
termination_by a