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20 Can mathematics get from other sciences what it got from physics? Jan 9 '15
19 With this definition of completeness, Gödel's Incompleteness result seems not surprising, so why it was back then? Apr 6 '18
14 Open Sets in Product Topology. Jul 13 '13
12 The notation $\prod_{g\in G} g$ for a finite group not well-defined. Feb 9 '13
10 Show that a semigroup with $aS \cup \{a\} = bS \cup \{b\}$ and $Sa \cup \{a\} = Sb \cup \{b\}$ is a group Jul 31 '18
10 Is there a difference between allowing only countable unions/intersections, and allowing arbitrary (possibly uncountable) unions/intersections? Jun 25 '12
10 Simple and intuitive example for Zorns Lemma Dec 5 '12
10 How are simple groups the building blocks? Jan 30 '16
9 Categorial definition of subsets Feb 5 '13
9 Convergence of sequences of inverse functions Sep 3 '13
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