Top network posts

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