Remarks on punctual local connectedness

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• Prof. Peter Johnstone, DPMMS
• Tuesday 27 October 2009, 14:15-15:45
• MR9, Centre for Mathematical Sciences.

If you have a question about this talk, please contact Julia Goedecke.

We study the condition, on a connected and locally connected geometric morphism $p:{\cal E}\to{\cal S}$, that the canonical natural transformation $p_*\to p_!$ should be (pointwise) epimorphic—- a condition which F.W. Lawvere called the `Nullstellensatz’, but which we prefer to call `punctual local connectedness’. We show that this condition implies that $p_!$ preserves finite products, and that, for bounded morphisms between toposes with natural number objects, it is equivalent to being both local and hyperconnected.

This talk is part of the Category Theory Seminar series.

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