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accepted What's the difference between “$\to$” (implication) and “$\vdash$” (therefore)?
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accepted Are all the open sets in a Euclidean space homeomorphic?
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comment The number of $n$-tuples with a sum less than $m$ is $C_m^n$?
You are absolutely right. How did I miss that? By the way @Solomon's answer is equivalent. The key point is summing.
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accepted The number of $n$-tuples with a sum less than $m$ is $C_m^n$?
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asked The number of $n$-tuples with a sum less than $m$ is $C_m^n$?
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accepted You only need countable many sets each time in a generated $\sigma$-algebra, right?
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accepted How do I prove that $\cos{\frac{2\pi}{7}}\notin\mathbb{Q}$?
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