English
For any group G, the set Conj G with operation x ◃ y := y^{-1} x y forms a quandle.
Русский
Для группы G множество Conj G с операцией x ◃ y := y^{-1} x y образует квардлу.
LaTeX
$$$x \triangleleft y = y^{-1} x y$$$
Lean4
instance quandle (G : Type*) [Group G] : Quandle (Conj G)
where
act x := @MulAut.conj G _ x
self_distrib := by
intro x y z
dsimp only [MulAut.conj_apply]
simp [mul_assoc]
invAct x := (@MulAut.conj G _ x).symm
left_inv x y := by simp [mul_assoc]
right_inv x y := by simp [mul_assoc]
fix := by simp