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Tomae function

Here we will take a look at the Thomae function, i.e. a function that is discontinuous on the rational numbers but continuous on the irrationals.

Fekete's Lemma

Here we will take a look at Feteke's Lemma, an elementary result in the study of sequences.

Metric Geometry: Commuting isometries in CAT(0) space

Here we will take a look at two interesting results about isometries in CAT(0) spaces.