Paul Raff
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 11 limit ${\lim_{x \to 49} \frac{\sqrt{x}-7}{x-49} }.$ 5 Two different solutions to integral 3 Is it always true that $(A_1 \cup A_2) \times (B_1 \cup B_2)=(A_1\times B_1) \cup (A_2 \times B_2)$ 3 Why isn't this function $f:\mathbb N \to \mathcal P(\mathbb N)$ a surjection? 3 Prove that the sets $(A\cap B)$ \ C and $(A\cap C)$ \ B are disjoint.

### Reputation (480)

 +10 European Calls: arbitrage +10 Exponential Probability distribution +20 Is it always true that $(A_1 \cup A_2) \times (B_1 \cup B_2)=(A_1\times B_1) \cup (A_2 \times B_2)$ +10 Working out minimum sample size

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### Tags (13)

 11 limits 3 proof-writing 9 elementary-set-theory × 3 2 algebra-precalculus 6 calculus × 2 1 real-analysis × 3 5 integration 1 statistics 3 cardinals 1 permutations

### Accounts (2)

 Mathematics 480 rep 26 Stack Overflow 141 rep 2