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Caption: Mathematical Models by Arnold Emch - Series 4 (1928)
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IV Series 7 Fig. 1 ant curves, also for general involutorial Cremona transformations in the plane, and with extensions to space, has been given by the author in a number of papers.a N o w when K m is a point (aia2a3) = (a) = B a\U\ + a2u2 + 03^3 = 0, we get the invariant cubic aSee On surfaces and curves which are invariant under involutory Cremona transformations, American Journal of Mathematics vol. 48 (1926), pp. 21-44, and references given.
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