| Abstract: |
| We define an abstract complex saddle loop in $\mathbb C^2$ as a pair $(\mathcal F,R)$ of a hyperbolic normalized saddle foliation $\mathcal F$ with a corner Dulac map $D$ and a regular map $R\in \mathrm{Diff}(\mathbb C,0)$. Up to an appropriate equivalence relation that corresponds to different determinations of complex Dulac and to transversal changes, the first return map is given by $F=RD$ on the universal cover of the standard quadratic domain. We show that such Poincar\` e maps are \emph{rigid}, in the sense that their non-ramified formal conjugacy implies the analytic conjugacy (in $\mathrm{Diff}(\mathbb C,0)$, lifted to the universal cover). |
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