0 ⋅ a = 0

Start from the conclusion and work back up the proof. Click the arrow to show the parents.

• 0 ⋅ a = 0,

  if the following are true:

  • a = b
  • a = c

  then b = c

  • a ⋅ 0 = 0 ⋅ a, a ⋅ b = b ⋅ a
  • a ⋅ 0 = 0, a ⋅ 0 = 0