Top network posts

• 375 How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
• 275 The Mathematics of Tetris
• 158 What are examples of very aggressive openings?
• 155 $\int_{-\infty}^{+\infty} e^{-x^2} dx$ with complex analysis
• 128 Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$
• 104 100 Soldiers riddle
• 90 What is special about the numbers 9801, 998001, 99980001 ..?
• View more network posts →