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Continuum theory, point-set topology, spaces with algebraic structure, foundations, dimension theory, local and global properties.

184 votes
8 answers
12k views

Two commuting mappings in the disk

Suppose that $f$ and $g$ are two commuting continuous mappings from the closed unit disk (or, if you prefer, the closed unit ball in $R^n$) to itself. Does there always exist a point $x$ such that $f( …
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11 votes
0 answers
575 views

Is every Baire metric space a complete metric space in disguise?

I am currently giving lectures in real analysis and a student asked an interesting question I couldn't answer, so I'm posting it here: Let's say that a metric space $X$ is Baire if every countable int …
fedja's user avatar
  • 61.9k