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Updated: May 23, 2025
"I am going to demonstrate that all kinds of orthogonal surfaces in which the three systems are isothermal, are 1st, those of the superficies of the second order; 2nd, those of the ellipsoides of revolution around the small axis and the grand axis; 3rd, those but no," said the madman, reflecting, "I will commence with him on the planetary system."
Thus," added he, with extreme volubility, "I would have told him my opinion on the isothermal and orthogonal superficies, causing him to observe that the equations of partial differences, of which the geometrical explanation is summed up in two orthogonal superficies, cannot generally be integral on account of their complication.
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