case dia α χ =>
  sorry
Y : TNode
y : Formula
y_in_Y :
  y ∈
    match Y with
    | (L, R, none) => ↑(L ++ R)
    | (L, R, some (Sum.inl (~'χ))) => ↑(L ++ R) + {~unload χ}
    | (L, R, some (Sum.inr (~'χ))) => ↑(L ++ R) + {~unload χ}
α : Program
χ : LoadFormula
Y_in_ress : ∃ a b, (a, b) ∈ unfoldDiamondLoad α χ ∧ (a, [], Option.map Sum.inl b) = Y
⊢ lmOfFormula y < 1 + (lmOfProgram α + lmOfFormula (unload χ))
no goals