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Published online by Cambridge University Press: 15 September 2017
Page 386 of note * loc. cit., p. 58.
Page 387 of note * This is the same as saying that TXY is a triangle whose orthocentre is Z. (Vide p. 59 above.)
Page 388 of note * Vide Casey’s Sequel to Euclid, p. 138 (4) [1886 edition]. Unfortunately, I cannot think of any more recent geometry textbook which deals with this problem.
Page 388 of note † loc. cit., p. 58 above.