Smart, Edward Howard · London : Macmillian and Co. · leaf 52
Then we have AFAACF Fig. 86. aagf aacf-aagf a ago Similarly, A BOP A BGFBD_AAGBDC~AAGCAF BD CEAAGCDC ~ A BCF - A BGF A BGC , CE A BGC and — = ; EA AAGB AAGB A BGC = 1. FB DC EA A BGC A AGC AAGB The signs of the two products AF. BD. CE and FB. DC. EAare necessarily like. For the above figures…
Geometry, Projective
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