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A history of Greek mathematics - Wilbourhall.org

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206 SUCCESSORS OF THE GREAT GEOMETERS<br />

where c, a have the same meaning as above. The different<br />

sections parallel to the axis <strong>of</strong> revolution are obtained by<br />

giving (say) z any value between and c + a. For the value<br />

two fixed points as poles, W — const.<br />

z — a the curve is the oval <strong>of</strong> Cassini which has the property<br />

that, if r, r' be the distances <strong>of</strong> any point on the curve from<br />

For, if z — a, the equation<br />

becomes<br />

(x 2 + y<br />

2<br />

+ c 2 )<br />

2<br />

= 4

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