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Problem 910: Product thickening creates many connected subsets
product_thickening_obstruction: A nondegenerate connected planar set times an interval has a connected dense core and freely attachable boundary fiber, giving two to the continuum connected subsets.
The [[research/erdos_910/product_thickening_obstruction|argument on product thickening creates many connected subsets]] records its exact scope, source premises, and remaining gap toward [[problems/analysis/E0910/_index|Problem 910]].
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