Top network posts

• 21 Sum of series $\sum \limits_{k=1}^{\infty}\frac{\sin^3 3^k}{3^k}$
• 17 Erroneous proof that derivative of function is always continuous
• 17 Infinite group has infinitely many subgroups, namely cyclic subgroups.
• 16 $A+B+C+7$ is perfect square where $A,B,C$ numbers with repeating digits.
• 14 Every separable metric space has a countable base
• 13 A finite set is closed
• 12 Solve an equation of 4th degree
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