linarith
G : Type u_1
inst✝ : AddCommGroup G
f : G → ℤ
bound : ℕ
h : AlmostAdditive f bound
f₁ : G → ℤ
bound₁ : ℕ
h₁ : AlmostAdditive f₁ bound₁
f₂ : G → ℤ
bound₂ : ℕ
h₂ : AlmostAdditive f₂ bound₂
x y : G
⊢ f₁ (x + y) + f₂ (x + y) - (f₁ x + f₂ x) - (f₁ y + f₂ y) = f₁ (x + y) - f₁ x - f₁ y + (f₂ (x + y) - f₂ x - f₂ y)
no goals