Abstract
In this paper, we give a necessary and sufficient condition for a graphical strip in the Heisenberg group \({\mathbb {H}}\) to be area-minimizing in the slab \(\{-1<x<1\}\). We show that our condition is necessary by introducing a family of deformations of graphical strips based on varying a vertical curve. We show that it is sufficient by showing that strips satisfying the condition have monotone epigraphs. We use this condition to show that any area-minimizing ruled entire intrinsic graph in the Heisenberg group is a vertical plane and to find a boundary curve that admits uncountably many fillings by area-minimizing surfaces.
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