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the same are equal to one another p 109 Art 106 IV
is found to have important applications and it is proved pp 519 620 that
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abcd algebra anharmonic co-ordinates anharmonio arbitrary arcs axis bisects Calculus centre circle co-initial coefficients collinear common Compare the Note complanar conio conjugate considered curve denote derived differential diplanar direction eaoh ellipsoid equal example expression formula fourth proportional function geometrical given plane given points harmonic conjugate harmonic equations homographically imaginary interpretation intersection involution length line at infinity line oa linear equation locus mean point multiplication negative notation null vector oomp opposite parallelogram perpendicular plane abc points p0 positive quadrilateral quinary symbols ratio reciprocal relative direction represented respectively revector right line right quaternions right quotient right versor roots rotation round satisfied scalar second construction SECTION sides sphere spherical spherical angle spherical triangle sub-art supposed tangent tensor theorem three lines transformations triangle abc unit-vector variable VIII whence whereof whioh whole number write zero