def prop_all_included(self):
t = implies(lambda i: i < self.depth, int)
vals = values(self.depth, t)
return forall(
int,
lambda i: i in vals if i < self.depth else True,
)
def prop_all_contained(self):
vals = values(self.depth, self.evens)
return forall(
implies(lambda i: i < self.depth, int),
lambda i: i in vals if is_even(i) else True,
)