Top network posts

• 14 What is the number of Sylow p subgroups in $S_p$?
• 12 The real numbers are a field extension of the rationals?
• 11 Is there a combinatorial explanation for the identity: $\sum_{k=1}^n c(n,k)2^k = (n+1)!$
• 11 If $\varphi(x) = m$ has exactly two solutions is it possible that both solutions are even?
• 11 Is every open interval a union of half open intervals?
• 10 Why is the set of integers with the operation of addition considered a cyclic group?
• 10 The number of families of subsets of $\{1,2,...,n\}$ whose union is not the whole set.
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