Proof: Zero Plus a
Let's prove the following theorem:
0 + a = a
Proof:
| # | Claim | Reason |
|---|---|---|
| 1 | a + 0 = a | a + 0 = a |
| 2 | a + 0 = 0 + a | a + 0 = 0 + a |
| 3 | 0 + a = a | if a + 0 = a and a + 0 = 0 + a, then 0 + a = a |
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