Zhuoran He's user avatar
Zhuoran He's user avatar
Zhuoran He's user avatar
Zhuoran He
  • Member for 6 years, 6 months
  • Last seen more than 5 years ago
12 votes
Accepted

Concavity of max of two concave functions

10 votes

How to estimate $\int^{1}_{-1} \left(\frac{\sin{x}}{x}\right)^{300} dx$ to 1 significant figure?

6 votes

Proving $\tan\left( \frac {a+b}{2}\right) = \frac{\sin a+\sin b} {\cos a + \cos b } $

5 votes
Accepted

Finding $\int_0^1 \frac{1}{x}\; dx$ using definition

5 votes

How to see that K-means objective is non-convex?

5 votes

Proving binomial theorem in $\mathbb Z$ modulo $p$ where $p$ is prime

5 votes
Accepted

Evaluate $\int_0^\infty \frac{\sin s\cos s} s \,ds$ using $\int_0^\infty\frac{\sin s} s \, ds=\frac \pi 2$

4 votes
Accepted

How can I find the maximum of a function with an unknown n parameters?

4 votes

Proving that $\frac{ab}{c^3}+\frac{bc}{a^3}+\frac{ca}{b^3}> \frac{1}{a}+\frac{1}{b}+\frac{1}{c}$

4 votes
Accepted

Largest possible area of the triangle ABC such that AB≤2, BC≤3, AC≤4.

4 votes
Accepted

Simson's Rule but Intervals Aren't the Same

4 votes

Conditional expectation of random variable given a sum

3 votes
Accepted

Show that $\int_0^\infty \frac{e^{\sin x}-1}{\sqrt{x}x}dx$ converges

3 votes
Accepted

Stearing wheel on parabola shaped road?

3 votes
Accepted

What is the value of $i^{i^{i^{\cdots}}}$

3 votes
Accepted

How to add Decibels?

3 votes

Does there exist a smooth approximation of $x \bmod y$?

3 votes

statement to match truth table

3 votes

How can I prove that this function is bounded using the given 2 hints?

3 votes

Integration of trig function

2 votes

Integer program for Lights Out game

2 votes
Accepted

The generators in the definition of Grassmann Algebra

2 votes
Accepted

Markov Chain (Simple Random Walk) distribution

2 votes

From Exponential Distributions to Weibull Distribution (CDF)

2 votes
Accepted

Estimating the error for $e-(1+\frac 1n)^n$

2 votes
Accepted

Solve the recurrence

2 votes
Accepted

Positive subspace for symmetric matrix

2 votes

Show ($n+1$)$2^n$ = $\sum_{i\geq 0}^{} {n + 1\choose i}i$ algebraically.

2 votes
Accepted

Conditional Gaussian confusion

2 votes
Accepted

Find $AC$ WITHOUT using Cosine law...