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Pappus 6 Parent 13 Pascal 9 Plateau 125 Plato 5 Plücker 19 Poisson 14 Poncelet 14 Ptolomaeus 6 Puiseux 72 Pythagoras 5. Richelot 16 Riemann 110. Saint-Venant 72 Scheeffer 118 Schooten 13 Serret, A. 50 Seydewitz 33 Simpson 11 Smith 29 Snellius 16 Spottiswoode 124 Staudt 19 Steiner 18 Stewart 11 Sturm, Ch. 104. Tartaglia 8 Thales 4 Transon 81. Vieta 9. Waring 22 Wren 32. Berichtigung.