OpenAI reports analytic caustics from a continuous billiard foliation

For a smooth strictly convex planar billiard with positive boundary curvature, a continuous foliation of a full near-grazing phase annulus by individually invariant essential curves forces an analytic boundary and a jointly analytic collar of smooth strictly convex caustics.

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Understanding the problem

Read the background

For a smooth strictly convex planar billiard with positive boundary curvature, a continuous foliation of a full near-grazing phase annulus by individually invariant essential curves forces an analytic boundary and a jointly analytic collar of smooth strictly convex caustics.

Why it matters

If correct, upgrades a continuous full phase foliation to the analytic physical caustics needed by the companion ellipse-rigidity theorem.

What counts as progress

Does a continuous full foliation near grazing force an analytic collar of billiard caustics?

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