English
Equality of mk'' a and mk'' b is equivalent to the setoid relation.
Русский
Равенство mk'' a и mk'' b эквивалентно отношению по множеству эквивалентности.
LaTeX
$$$\\forall a,b:\\, s_1 a b \\iff \\operatorname{Quotient.mk''} a = \\operatorname{Quotient.mk''} b$$$
Lean4
protected theorem eq'' {a b : α} : @Quotient.mk'' α s₁ a = Quotient.mk'' b ↔ s₁ a b :=
Quotient.eq