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Nick Peterson's user avatar
Nick Peterson's user avatar
Nick Peterson's user avatar
Nick Peterson
  • Member for 10 years, 11 months
  • Last seen this week
  • San Mateo, CA
104 votes
Accepted

What does "isomorphic" mean in linear algebra?

96 votes
Accepted

Integration with respect to counting measure.

65 votes
Accepted

Drunk man with a set of keys.

59 votes
Accepted

Fourier Transform of Derivative

58 votes
Accepted

Integral Inequality Absolute Value: $\left| \int_{a}^{b} f(x) g(x) \ dx \right| \leq \int_{a}^{b} |f(x)|\cdot |g(x)| \ dx$

51 votes
Accepted

Probability that a quadratic equation has real roots

45 votes

Why does L'Hopital's rule fail in calculating $\lim_{x \to \infty} \frac{x}{x+\sin(x)}$?

42 votes

What does expected value of sum of two discrete random variables mean?

31 votes
Accepted

What is the standard notation to represent the set of primes?

21 votes

For $f$ continuous, show $\lim_{n\to\infty} n\int_0^1 f(x)x^n\,dx = f(1).$

21 votes
Accepted

Prove that in a tree with maximum degree $k$, there are at least $k$ leaves

20 votes
Accepted

Showing that $U(2^n)$ is not cyclic for $n \ge 3$

19 votes

Two Circles Can Have At Most One Common Chord? (IMO)

16 votes

Injection $\mathbb N \times \mathbb N \times \mathbb N \to \mathbb N$

15 votes
Accepted

Expected value of rolling dice until getting a $3$

15 votes

Grandi's series contradiction

15 votes

Infinite Cartesian product of countable sets is uncountable

15 votes

But what is a continuous function?

14 votes
Accepted

Notation used for integrals w.r.t. probability measures

13 votes
Accepted

Puzzled by $\lim\limits_{x \to - \infty} \sqrt{x^2+x}-x$

13 votes

pigeonhole principle clarification

13 votes

Integral of a function's derivative does not equal the original function?

13 votes

What is the intuition behind the formula for the average?

12 votes

How to prove $\sum_{n=0}^{\infty} \frac{n^2}{2^n} = 6$?

12 votes
Accepted

Prove that $2^n3^{2n}-1$ is always divisible by 17

11 votes
Accepted

Maclaurin Series for $\ln(x+\sqrt{1+x^2})$

11 votes
Accepted

Motivation for Jordan Canonical Form

11 votes
Accepted

"such that" logical symbol

11 votes

What is the derivative of $x\sin x$?

11 votes
Accepted

Logarithm of Gaussian function is whether convex or nonconvex?

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