Theorem: rot_zero_vadd (Instructor/Lectures/grad/vector_spaces.lean)

State before:
⊢ ∀ (p : State), 0 +ᵥ p = p
Tactic:
intro p
State after:
p : State
⊢ 0 +ᵥ p = p

State before:
p : State
⊢ 0 +ᵥ p = p
Tactic:
cases p
State after:
case heading
h✝ : K
unit✝ : ℕ
⊢ 0 +ᵥ heading h✝ unit✝ = heading h✝ unit✝

State before:
case heading
h✝ : K
unit✝ : ℕ
⊢ 0 +ᵥ heading h✝ unit✝ = heading h✝ unit✝
Tactic:
repeat { rfl }
State after:
no goals

State before:
case heading
h✝ : K
unit✝ : ℕ
⊢ 0 +ᵥ heading h✝ unit✝ = heading h✝ unit✝
Tactic:
rfl
State after:
no goals