arXiv:2610.37985v1 Announce Type: new Abstract: We determine the intrinsic Fisher geometry of the two-parameter circular wrapped normal family. Although its finite parameters form a cylinder, its metric completion is a disk: adjoining the uniform law extends the Fisher metric to a positive-definite real-analytic metric. The Gaussian curvature vanishes at the added point, is positive nearby, and tends to $-1/2$ as the underlying standard deviation tends to zero. We prove that the curvature has exactly one nonuniform zero radius and exactly one critical radius, the latter a nondegenerate positive maximum. Opposite points sufficiently close to uniformity are joined by a unique minimizing geodesic through the uniform law, so their intrinsic distance is not attained inside the nonuniform family. In contrast, identifying the means of real normal distributions modulo a period retains a complete hyperbolic cylinder with an infinitely distant cusp. Wrapping strictly decreases Fisher information in every nonzero tangent direction, while the information deficit and its fixed-order derivatives are exponentially small as the standard deviation tends to zero. The curvature theorem is proved by convergent series and explicit analytic remainder estimates; numerical figures serve only as illustrations.
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