PROOF 115
Prove.
In a proportion, the product of the extremes equals the product of the means
On the rational numbers ℚ.
Definition D1
For b ≠ 0 and d ≠ 0, a : b = c : d means a/b = c/d.
Proof.
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PROOF 115
In a proportion, the product of the extremes equals the product of the means
On the rational numbers ℚ.
Definition D1
For b ≠ 0 and d ≠ 0, a : b = c : d means a/b = c/d.
Proof.
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