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Continuum Theory

Daron Anderson (virtual)

Subevent of Continuum Theory - Thurs. AM

Forbes 2070A

Eastern Time (US & Canada)

Starts at: 2025-03-06 11:55AM

Ends at: 2025-03-06 12:15PM

Hereditarily Decomposable Continua have Non-Block Points

Daron Anderson ⟨daronanderson@live.ie⟩

Abstract:

We expand upon our earlier results, to show that every nondegenerate hereditarily decomposable Hausdorff continuum has two or more non-block points, i.e points whose complements contain a continuum-connected dense subset. The celebrated non-cut point existence theorem states that all nondegenerate Hausdorff continua have two or more non-cut points, and the corresponding result for non-block points is known to hold for metrizable continua. It is also known that there are consistent examples of Hausdorff continua with no non-block points, but that non-block point existence holds for Hausdorff continua that are either aposyndetic, irreducible, or separable.

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