SPACE OF INITIAL VALUES OF A MAP WITH A QUARTIC INVARIANT
Keyword(s):
Abstract We compactify and regularise the space of initial values of a planar map with a quartic invariant and use this construction to prove its integrability in the sense of algebraic entropy. The system has certain unusual properties, including a sequence of points of indeterminacy in $\mathbb {P}^{1}\!\times \mathbb {P}^{1}$ . These indeterminacy points lie on a singular fibre of the mapping to a corresponding QRT system and provide the existence of a one-parameter family of special solutions.
2001 ◽
Vol 34
(48)
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pp. 10533-10545
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