3 entries in 0.568s
a111: 1 result for "pappus", http://btcbase.org/log-search?q=pappus
mircea_popescu: !#s pappus
mircea_popescu: anyway, fuck him. let's wash the useemly americana out with some cosideration of the beauty of reasoned truth. so : pappus was this greek from alexandria who first documentedly observed that if given two sets of colinear points, then the intersections of the lines uniting them will also be colinear. the beauty is that this theorem holds in all projective planes built over fields, but does not hold in projective planes derived