Proof: Example 2
Let's prove the following theorem:
if b > 0, then (0 - 0) / ((b ⋅ 2) - 0) = 0
Proof:
Given
| 1 | b > 0 |
|---|
| # | Claim | Reason |
|---|---|---|
| 1 | 2 > 0 | 2 > 0 |
| 2 | (b ⋅ 2) - 0 = b ⋅ 2 | (b ⋅ 2) - 0 = b ⋅ 2 |
| 3 | b ⋅ 2 = (b ⋅ 2) - 0 | if (b ⋅ 2) - 0 = b ⋅ 2, then b ⋅ 2 = (b ⋅ 2) - 0 |
| 4 | b ⋅ 2 > 0 | if b > 0 and 2 > 0, then b ⋅ 2 > 0 |
| 5 | (b ⋅ 2) - 0 > 0 | if b ⋅ 2 > 0 and b ⋅ 2 = (b ⋅ 2) - 0, then (b ⋅ 2) - 0 > 0 |
| 6 | not ((b ⋅ 2) - 0 = 0) | if (b ⋅ 2) - 0 > 0, then not ((b ⋅ 2) - 0 = 0) |
| 7 | 0 / ((b ⋅ 2) - 0) = 0 | if not ((b ⋅ 2) - 0 = 0), then 0 / ((b ⋅ 2) - 0) = 0 |
| 8 | 0 - 0 = 0 | 0 - 0 = 0 |
| 9 | (0 - 0) / ((b ⋅ 2) - 0) = 0 / ((b ⋅ 2) - 0) | if 0 - 0 = 0, then (0 - 0) / ((b ⋅ 2) - 0) = 0 / ((b ⋅ 2) - 0) |
| 10 | (0 - 0) / ((b ⋅ 2) - 0) = 0 | if (0 - 0) / ((b ⋅ 2) - 0) = 0 / ((b ⋅ 2) - 0) and 0 / ((b ⋅ 2) - 0) = 0, then (0 - 0) / ((b ⋅ 2) - 0) = 0 |
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