Top network posts

• 28 What are some examples of mathematics that had unintended useful applications much later?
• 27 An intuitive idea about fundamental group of $\mathbb{RP}^2$
• 26 Rotman's exercise 2.8 "$S_n$ cannot be imbedded in $A_{n+1}$"
• 23 What to do with a new mathematics conjecture?
• 19 What is the difference between a Hamel basis and a Schauder basis?
• 10 Fundamental class of the connected sum of two closed orientable manifolds
• 8 Prove that if a normal subgroup $H$ of $ G$ has index $n$, then $g^n \in H$ for all $g \in G$
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