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840. [K1. 6.] Imaginary Circles in Cartesian Geometry

Published online by Cambridge University Press:  03 November 2016

B. C. Atkin
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Abstract

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Type
Mathematical Notes
Information
The Mathematical Gazette , Volume 13 , Issue 183 , July 1926 , pp. 160 - 161
Copyright
Copyright © Mathematical Association 1926

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References

* I refrain from discussing circles with real equations which become imaginary for certain values of the coefficients (e.g. x 2+y 2+1=0). In any case these belong to the comparatively uninteresting type which has real centres, but no real points or tangents. The circles I am discussing may, if a name be desirable, be called “essentially imaginary” circles.