Top network posts

• 62 In a topological space if there exists a loop that cannot be contracted to a point does there exist a simple loop that cannot be contracted also?
• 48 How can a mathematician handle the pressure to discover something new?
• 34 divisors of $p^4+1$ of the form $kp+1$
• 32 Second Betti number of lattices in $\mathrm{SL}_3(\mathbf{R})$
• 32 Does there exists a group structure on $\circ$ on $(\mathbb{R},\circ)$ such that $(\mathbb{R},\circ)$ is non-isomorphic to $(\mathbb{R},+)$?
• 31 Are infinite groups in which most elements have order $\leq 2$ commutative?
• 28 Does GL_n(Z) have a noetherian group ring?
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