cases t₂
case mpr.intro.mk
α : Type u_1
inst✝² : DecidableEq α
inst✝¹ : Inhabited α
𝓓 : DeductionParameter α
inst✝ : 𝓓.IncludeEFQ
t₂ : Tableau α
fst✝ snd✝ : Theory α
h₁ : (fst✝, snd✝).1 = t₂.1
h₂ : (fst✝, snd✝).2 = t₂.2
⊢ (fst✝, snd✝) = t₂
case mpr.intro.mk.mk
α : Type u_1
inst✝² : DecidableEq α
inst✝¹ : Inhabited α
𝓓 : DeductionParameter α
inst✝ : 𝓓.IncludeEFQ
fst✝¹ snd✝¹ fst✝ snd✝ : Theory α
h₁ : (fst✝¹, snd✝¹).1 = (fst✝, snd✝).1
h₂ : (fst✝¹, snd✝¹).2 = (fst✝, snd✝).2
⊢ (fst✝¹, snd✝¹) = (fst✝, snd✝)