Ramaswamy's conjecture on fail points

Let Ω\Omega be a planar convex domain symmetric about the two coordinate axes. A fail point is a point where uΩ|\nabla u_{\Omega}| attains its maximum, where uΩu_{\Omega} is the torsion function. The largest inscribed circle is a circle of maximal radius contained in Ω\Omega.

Ramaswamy's conjecture. The fail points occur either at the contact points of the largest inscribed circle or at points of minimal curvature.

This modified conjecture was proposed after Saint-Venant's conjecture was disproved and has been widely accepted in the mechanical engineering community. The source gives no resolution of Ramaswamy's conjecture.

Sources & referencesView supporting material

Primary source

Qinfeng Li, Shuangquan Xie, Hang Yang and Ruofei Yao, “On the location of the maximal gradient of the torsion function over some non-symmetric planar domains”, arXiv:2406.04790 (2026).

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