Enrico M.'s user avatar
Enrico M.'s user avatar
Enrico M.'s user avatar
Enrico M.
  • Member for 8 years, 7 months
  • Last seen this week
  • Bologna, Italy
65 votes
Accepted

Is there a way to find the log of very large numbers?

28 votes

What is the solution to Nash's problem presented in "A Beautiful Mind"?

24 votes

Square of a differential

21 votes

Unifying the connections between the trigonometric and hyperbolic functions

14 votes
Accepted

Integrate $x^2 e^{-x^2/2}$

11 votes
Accepted

Convergence of $\int_{0}^{+\infty} \frac{x}{1+e^x}\,dx$

9 votes

$\sum k! = 1! +2! +3! + \cdots + n!$ ,is there a generic formula for this?

9 votes
Accepted

Pythagoras: Get b when only a and angle α are given

8 votes
Accepted

$i^i \approx 1/5$ or what is it?

8 votes
Accepted

Help with $\lim_{x\to \infty}{\sin{1\over x}\over {1\over x}}$

8 votes

What number comes next in the sequence $7, 16, 8, 27, 9,...$?

8 votes

Evaluate $\int_{-\infty}^{\infty}\frac{\sin x}{x}\mathop{}\! \mathrm dx$

8 votes

Good substitution for this integral

8 votes

A hint to calculate the integral $\int^1_0 \frac{\log x}{1-x}dx$

7 votes
Accepted

Why is $x^2\ln\sqrt{x}$ equal to $\frac{x^2}{2}\ln x$?

7 votes
Accepted

What is the most general form of the Navier-Stokes equation?

6 votes
Accepted

Is $9*(1/9) = 0.99999999...$ statement correct?

6 votes
Accepted

Choosing a substitution to evaluate $\int \frac{x+3}{\sqrt{x+2}}dx$

6 votes

Find the power series representation of $e^{-x^2}$

6 votes
Accepted

Sum of series $n\cdot\sin x^n$

6 votes

Calculate integral with help the Euler's integrals

6 votes
Accepted

Solutions of the equation $x^2+1 = 0$

6 votes

Integral: $\int_{0}^{1}\frac{\arctan^{2}\left(x\right)}{x}dx$

5 votes

Does this generalization of matrix exponential formula make sense?

5 votes

Proving $x^2+x+1\gt0$

5 votes

Find the coefficient of $x^{16}$ in $(1 + x + x^2 + x^3 + x^4 + x^5)^4$

5 votes
Accepted

Integral of $x^{\sqrt x}$

5 votes

$P^2 + P + 1$ is prime if $P$ is prime.

5 votes
Accepted

Solution of $\int_0^\infty\frac{\ln(1+{x^2})}{1+{x^2}}$

5 votes

definite integral of a trigonometric function with log

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