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QuinnLesquimau
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Master student in mathematics at Bonn.

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49
Is there an infinite topological space with only countably many continuous maps to itself?
26
Is there an infinite topological space with only countably many continuous functions to itself?
19
Is there a topological space of cardinality $\kappa$ containing all metric spaces of cardinality $\kappa$?
12
Is there a nonstandard model of Peano's arithmetic where any element has only finitely many prime divisors?
11
In a metric space, is every open subset a non-redundant union of open balls?