Smart, Edward Howard · London : Macmillian and Co. · leaf 54
= 4-1 in each case Pig. 9. It follows then that AF BD CEBF ■ DC ■ EA or AF . BD . CE = - FB . DC . EA. Conversely. If D, E, F be taken on the sides so as to fulfilthis condition, these points are collinear.For let EF meet BC in D. Then AF. BD. CE = - FB . DC. EA by the preceding.But AF . BD . CE =…
Geometry, Projective
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