Top network posts

• 34 Geometric interpretation for complex eigenvectors of a 2×2 rotation matrix
• 33 Ring of integers is a PID but not a Euclidean domain
• 20 If two norms are equivalent on a dense subspace of a normed space, are they equivalent?
• 19 Prove $G/\ker \phi \times \ker \phi \cong G$
• 18 When is an accumulation point not the limit of some sequence in a topological space?
• 17 Invertible matrices over a commutative ring and their determinants
• 17 Combinatorial proof of $\sum^{n}_{i=1}\binom{n}{i}i=n2^{n-1}$.
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