A geometric construction based on pencils of quadrics in P3 with branched generators recovers the d- and q-discrete Painlevé equations of types A0(1), A1(1), and D4(1).
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Discrete Painlev\'e equations from pencils of quadrics in $\mathbb P^3$ with branching generators
A geometric construction based on pencils of quadrics in P3 with branched generators recovers the d- and q-discrete Painlevé equations of types A0(1), A1(1), and D4(1).