The Theory of Differential Equations (vol. 5): Part IV: Partial Differential Equations
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Cantwell [Introduction to Symmetry Analysis](https://isidore.co/calibre/browse/book/6578) p. 3, PDF pp. 47:> In his 1906 treatise on *The Theory of Differential Equations* [vols. 5 & 6] Andrew Forsyth devotes several chapters to Lie groups and Bäcklund transformations. It is a fact, however, that shortly thereafter, Lie’s ideas fell into obscurity and remained so until soon after World War II.[Grattan-Guinness](https://isidore.co/calibre#panel=book_details&book_id=6616) PDF p. 696fn1 cites "Forsyth *Equations* , 5 (1906), ch.6 [PDF pp. 229ff.]" regarding "Cauchy's procedure", "a version of what today is usually called 'the method of characteristics'" ( *ibid.* PDF p. 697). Cauchy-Kovalevskaya theorem discussed in ch. 2 (DjVu p. 50)
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