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Excerpt from Annaes Scientificos Da Academia Polytechnica Do Porto, 1914, Vol. 9
On peut se proposer de trou ver le point M' où la droite PQ Q touche son enveloppe J'ai, il y a longtemps donné une solution purement géométrique de ce problème que je vais reproduire ici. Je ferai ensuite connaître une solution égale ment géométrique du même problème pour la seconde transformation étud1ee dans la note mtée.
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