Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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VERA CIRCULI
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Fig. 1. 2. 3.</
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A # C # D # B
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A B E I O P, C; </
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K N P, D; </
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<
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xml:space
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co D eſſe medium harmonicum inter C & </
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A: </
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hujus 5, A + C: </
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permutando B + C: </
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ter B & </
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mutando differentia inter B & </
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B & </
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differentia inter D & </
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C ad B; </
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quod demonſtrare oportuit.</
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lygonis complicatis, ut patet ex ſcholio 5 hujus.</
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A ## B
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C # D # E
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rithmetica C, media geometrica D & </
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dia harmonica E. </
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tinuè proportionales. </
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ſunt in ratione harmonica; </
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que CE = DD; </
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portuit.</
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