On stable constant mean curvature surfaces with free boundary

In [20], Ros and Vergasta proved that an immersed orientable compact stable constant mean curvature surface $Σ$ with free boundary in a closed ball $B\subset\mathbb{R}^3$ must be a planar equator, a spherical cap or a surface of genus 1 with at most two boundary components. In this article, by using a modified Hersch type balancing argument, we complete their work by proving that $Σ$ cannot have genus 1.

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