Proof: Square Root Example
Let's prove the following theorem:
((s ⋅ s) ⋅ (1 / 4))(1 / 2) = s / 2
First, here are some examples: ((s ⋅ s) ⋅(1 / 4))(1 / 2) = s / 2
((3 ⋅ 3) ⋅ (1 / 4))^(1 / 2) = 3 / 2
((8 ⋅ 8) ⋅ (1 / 4))^(1 / 2) = 8 / 2 = 4
(8 ⋅ 125)^(1 / 2) = 125
(x + 3 ⋅ x + 3)^(1 / 2) = x + 3
Proof:
# | Claim | Reason |
---|---|---|
1 | (s ⋅ s) ⋅ (1 / 4) = (s / 2) ⋅ (s / 2) | (s ⋅ s) ⋅ (1 / 4) = (s / 2) ⋅ (s / 2) |
2 | ((s ⋅ s) ⋅ (1 / 4))(1 / 2) = ((s / 2) ⋅ (s / 2))(1 / 2) | if (s ⋅ s) ⋅ (1 / 4) = (s / 2) ⋅ (s / 2), then ((s ⋅ s) ⋅ (1 / 4))(1 / 2) = ((s / 2) ⋅ (s / 2))(1 / 2) |
3 | ((s / 2) ⋅ (s / 2))(1 / 2) = s / 2 | ((s / 2) ⋅ (s / 2))(1 / 2) = s / 2 |
4 | ((s ⋅ s) ⋅ (1 / 4))(1 / 2) = s / 2 | if ((s ⋅ s) ⋅ (1 / 4))(1 / 2) = ((s / 2) ⋅ (s / 2))(1 / 2) and ((s / 2) ⋅ (s / 2))(1 / 2) = s / 2, then ((s ⋅ s) ⋅ (1 / 4))(1 / 2) = s / 2 |
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