An Elementary Treatise on Quaternions

Voorkant
Clarendon Press, 1873 - 296 pagina's

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Pagina 138 - The locus of the middle points of a system of parallel chords in a parabola is called a diameter.
Pagina 11 - The perpendicular bisectors of the sides of a triangle meet in a point which is equidistant from the vertices of the triangle. Let the -l. bisectors EE' and DD

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