File:Cono-inverso.jpg
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DescriptionCono-inverso.jpg |
Italiano: Per determinare l'inverso v' di un cono quadrico v (fig. 5-2), si procede come di seguito
si determina il vertice V' di v' come punto d'intersezione di due generatrici, b', c', che si ottengono invertendo la corrispondenza che intercorre tra le proiezioni di due sezioni di v. Che sono in questo caso la base ΔV e la conica Δ del piano α (colore rosso). A tal fine, si determina il polo VV' di t'α rispetto a ΔV; e si congiunge con V, ottenendo cosi la retta polo l del piano corrispondente (passante per t'α e V) rispetto al cono v. Si fa passare . Per la retta l, un piano verticale β, che seziona v secondo due generatrici, b, c. L'intersezione delle quali con ΔV e Δ individua una copia di punti corrispondenti, A, AV e B, BV. Unendo A con Bv e B con Av si hanno due rette che si intersecano nel punto cercato V'. https://www.researchgate.net/publication/351229219_The_problem_of_tangency_to_three_non-homothetic_conics |
Date | |
Source | Own work |
Author | Hasanisawi |
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current | 21:42, 8 September 2021 | 793 × 905 (54 KB) | Hasanisawi (talk | contribs) | Uploaded own work with UploadWizard |
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Date and time of data generation | 00:38, 9 September 2021 |
Date and time of digitizing | 00:38, 9 September 2021 |
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