Proof: Substitution 15
Let's prove the following theorem:
if a = b, then a ⋅ a = b ⋅ b
Proof:
Given
| 1 | a = b |
|---|
| # | Claim | Reason |
|---|---|---|
| 1 | a ⋅ a = b ⋅ a | if a = b, then a ⋅ a = b ⋅ a |
| 2 | a ⋅ a = b ⋅ b | if a ⋅ a = b ⋅ a and a = b, then a ⋅ a = b ⋅ b |
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