Top network posts

• 103 Is it appropriate to assign Mechanical Turk-type tasks as extra credit?
• 85 Does $X\times S^1\cong Y\times S^1$ imply that $X\times\mathbb R\cong Y\times\mathbb R$?
• 51 How misleading is it to regard $\frac{dy}{dx}$ as a fraction?
• 43 Are there examples of non-orientable manifolds in nature?
• 38 Are the rationals minus a point homeomorphic to the rationals?
• 35 What makes four dimensions special?
• 34 Function which is continuous everywhere in its domain, but differentiable only at one point
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