A characteristic property of isothermal systems of curves. (English) JFM 35.0622.03

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[1] J. éc. polyt., cah. 57 (1887), p. 219. Liouville does not refer to Lie, but the latter, according to Vessiot’s report in the Encykl. der Math. (II A 4 b, p. 287), considered the same question in the Norw. Arch. for 1883.
[2] Lie-Scheffers, Differentialgleichungen, p. 157.
[3] Lie-Scheffers, ibid.Differentialgleichungen, There is however a simpler method, namely the intro duction of minimal coordinates, which involves but one quadrature.
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