Theorem: Tutorial.adjunction.dual (GlimpseOfLean/Exercises/Topics/GaloisAdjunctions.lean)

State before:
X : Type u_1
Y : Type u_2
inst✝¹ : PartialOrder X
inst✝ : PartialOrder Y
l : X → Y
r : Y → X
h : adjunction l r
⊢ adjunction r l
Tactic:
sorry
State after:
no goals