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For questions requesting examples of a certain structure or phenomenon

6 votes

Fundamental Examples

Dirichlet Function is a fundamental example in Calculus where Riemann integral does not work. It is also a function which is discontinuous everywhere. The function D(x) is defined as D(x) = 1, if x is …
4 votes

Fundamental Examples

The Thompson groups, as wikipedia said, have a collection of unusual properties which have made them counterexamples to many general conjectures in group theory. For example it is a finite generated f …