Top network posts

• 69 Why is the complex plane shaped like it is?
• 17 Intersection of infinite sets is infinite?
• 12 $1$ heap of sand $+\ 1$ heap of sand $= 1$ heap of sand?
• 9 Confusion about group theory; can you use the union as group operation?
• 7 $(-1)^0$ , calculating zeroth power of a negative number
• 7 How many functions are there from $\mathbb Z$ to $\mathbb Z$?
• 6 Does there exist an invertible matrix $A \in \mathbb{R}^{2 \times 2}$ such that $A+A^{-1}= O_2$?
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