Conic Sections from Whose Equations the XY-Term May be Eliminated by a Rotation of Axes Involving no Surd Numbers

1934 ◽  
Vol 41 (7) ◽  
pp. 441
Author(s):  
D. C. Duncan
2009 ◽  
Author(s):  
Apollonius of Perga
Keyword(s):  

1891 ◽  
Vol 31 (803supp) ◽  
pp. 12836-12837
Author(s):  
C. W. MacCord
Keyword(s):  

1966 ◽  
Vol 4 (1) ◽  
pp. 19-19
Author(s):  
James L. Cronin

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