Proof: Multiply by 0

Let's prove the following theorem:

0 ⋅ a = 0

Proof:

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Proof Table
# Claim Reason
1 a ⋅ 0 = 0 a ⋅ 0 = 0
2 a ⋅ 0 = 0 ⋅ a a ⋅ 0 = 0 ⋅ a
3 0 ⋅ a = 0 if a ⋅ 0 = 0 ⋅ a and a ⋅ 0 = 0, then 0 ⋅ a = 0

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