For any closed set K in R^n and m at least 2, ancient mean-convex mean curvature flows of hypersurfaces exist in R^{m+n} with a metric C^infty-close to Euclidean whose first-time singular set is exactly K times {0}.
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Mean curvature flows with prescribed singular sets
For any closed set K in R^n and m at least 2, ancient mean-convex mean curvature flows of hypersurfaces exist in R^{m+n} with a metric C^infty-close to Euclidean whose first-time singular set is exactly K times {0}.