October 21: Difference between revisions

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'''Are You Sure ...'''
{{Are_You_Sure/October 21}}
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[[File:Are You Sure (21 Oct 2020).png|thumb|left|Screenshot: Are You Sure (October 21, 2020)]]
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'''On This Day in History and Fiction'''
{{Selected anniversaries/October 21}}
{{Selected anniversaries/October 21}}

Revision as of 07:25, 18 October 2020

Are You Sure ...

• ... that mathematician and academic Wacław Sierpiński made important contributions to set theory (notably his research on the axiom of choice and the continuum hypothesis), number theory, theory of functions, and topology?


File:Are You Sure (21 Oct 2020).png
Screenshot: Are You Sure (October 21, 2020)


On This Day in History and Fiction