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κ(s) → ∞ at fold lines
A smooth surface developing infinite curvature at fold lines — the geometry of crumpling paper.
Smoothness collapsing into sharp, irreversible folds
Part of: SHAME
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Contraction
T(x) : ||T(x)-T(y)|| < ||x-y||

Fold
f(x) = f(−x), x → 0

Shrink
A(t) = A₀ · e^{-λt}

Veil
f(x) = f(x) · (1 - g(x))