Top network posts

• 31 The series $\sum_{n=1}^\infty\frac1n$ diverges!
• 28 Proving that the triangle inequality holds for a metric on $\mathbb{C}$
• 17 To show that orthogonal complement of a set A is closed.
• 14 Difficulty in finding a counterexample
• 11 How to evaluate $\int_0^\pi \cos(x) \cos(2x) \cos(3x) \cos(4x)\, dx$
• 10 To find the minimum value of $|z+1|+|z-1|+|z-i|$ where $z\in \Bbb C$.
• 10 $n^3+n<3^n$ for $n \geq4$ by induction.
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