Valtteri
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### Questions (72)

 21 Does every sequence of rationals, whose sum is irrational, have a subsequence whose sum is rational 18 Function $f(x)$, such that $\sum_{n=0}^{\infty} f(n) x^n = f(x)$ 10 Is $\lim_{x\rightarrow\infty}\frac{x}{\pi(x)}-\ln(x) =-1$? 9 Functions whose derivative is the inverse of that function 9 For primes $P_1$ and $P_2$, exists a prime $P_3$ that both $P_i + 6P_3$ is a prime

### Reputation (1,400)

 +15 Function $f(x)$, such that $\sum_{n=0}^{\infty} f(n) x^n = f(x)$ +25 A “trick” with a deck of cards, probability of equal result +5 For primes $P_1$ and $P_2$, exists a prime $P_3$ that both $P_i + 6P_3$ is a prime +5 Functions whose derivative is the inverse of that function

 3 Factorial related problems 2 Determining hyperreal class for $\frac{\epsilon + \delta}{\sqrt{\epsilon^2 + \delta^2}}$ 2 Diagrammatic Reasoning Problem 2 Calculator question involving $\log_2$? 2 Why study linear algebra?

### Tags (92)

 3 sequences-and-series × 12 2 linear-algebra × 2 3 number-theory × 2 2 logarithms × 2 3 permutations × 2 2 infinitesimals 3 combinations 2 motivation 3 factorial 2 calculator

### Accounts (8)

 Mathematics 1,400 rep 622 Stack Overflow 228 rep 210 Physics 194 rep 9 Mathematica 175 rep 4 English Language & Usage 118 rep 5