Skip to main content

Stack Exchange

Enrico M.

Bologna, Italy

The more time passes, the more I become curious, excited and enthralled about mathematics. I am understanding concepts I should have understood years ago. Years ago I understood concepts that only today I'm able to properly apply.

I know few things, I lose myself in glasses of water, I am right sometimes, ad wrong other times.

My humble hall of fame of answers:

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

top accounts reputation activity subscriptions
Top Questions
357 votes

Calculating the length of the paper on a toilet paper roll

calculus integration summation recreational-mathematics asked Jan 30, 2016 at 22:00
math.stackexchange.com

208 votes

How could we define the factorial of a matrix?

linear-algebra matrices operator-theory factorial matrix-calculus asked Jan 31, 2016 at 13:56
math.stackexchange.com

171 votes

Is there any integral for the Golden Ratio?

calculus integration big-list golden-ratio asked Feb 14, 2016 at 2:57
math.stackexchange.com

75 votes

Is the Boltzmann constant really that important?

thermodynamics statistical-mechanics temperature dimensional-analysis physical-constants asked Jan 22, 2016 at 1:39
physics.stackexchange.com

44 votes

Why is 7 TeV considered as a big amount of energy?

energy particle-physics kinematics large-hadron-collider order-of-magnitude asked Jan 14, 2016 at 17:07
physics.stackexchange.com

31 votes

Is $1+1 = 2$ true in any base?

elementary-number-theory arithmetic number-systems asked Aug 18, 2016 at 18:45
math.stackexchange.com

24 votes

Curvature of Hilbert space

quantum-mechanics hilbert-space metric-tensor curvature mathematics asked Jun 28, 2016 at 16:12
physics.stackexchange.com

15 votes

How to prove the result of this definite integral?

calculus integration definite-integrals asked Mar 12, 2016 at 19:39
math.stackexchange.com

11 votes

Mental $n-$th root of $N$

algebra-precalculus arithmetic roots recreational-mathematics asked Mar 25, 2016 at 19:35
math.stackexchange.com

11 votes

The "inverse" of $\nabla\times$ operator

vectors vector-analysis potential-theory asked Dec 2, 2015 at 12:57
math.stackexchange.com

1 2 3 4

Top Answers
65
Is there a way to find the log of very large numbers?
math.stackexchange.com

29
What is the solution to Nash's problem presented in "A Beautiful Mind"?
math.stackexchange.com

24
Square of a differential
math.stackexchange.com

21
Unifying the connections between the trigonometric and hyperbolic functions
math.stackexchange.com

14
Integrate $x^2 e^{-x^2/2}$
math.stackexchange.com

12
Convergence of $\int_{0}^{+\infty} \frac{x}{1+e^x}\,dx$
math.stackexchange.com

9
$\sum k! = 1! +2! +3! + \cdots + n!$ ,is there a generic formula for this?
math.stackexchange.com

9
Pythagoras: Get b when only a and angle α are given
math.stackexchange.com

8
Evaluate $\int_{-\infty}^{\infty}\frac{\sin x}{x}\mathop{}\! \mathrm dx$
math.stackexchange.com

8
Good substitution for this integral
math.stackexchange.com

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

8
A hint to calculate the integral $\int^1_0 \frac{\log x}{1-x}dx$
math.stackexchange.com

8
Help with $\lim_{x\to \infty}{\sin{1\over x}\over {1\over x}}$
math.stackexchange.com

7
Why is $x^2\ln\sqrt{x}$ equal to $\frac{x^2}{2}\ln x$?
math.stackexchange.com

7
$i^i \approx 1/5$ or what is it?
math.stackexchange.com

7
What is the most general form of the Navier-Stokes equation?
math.stackexchange.com

6
Integral: $\int_{0}^{1}\frac{\arctan^{2}\left(x\right)}{x}dx$
math.stackexchange.com

6
Solutions of the equation $x^2+1 = 0$
math.stackexchange.com

6
Find the coefficient of $x^{16}$ in $(1 + x + x^2 + x^3 + x^4 + x^5)^4$
math.stackexchange.com

6
Proving $x^2+x+1\gt0$
math.stackexchange.com

6
How to evaluate $\int_{0}^{1}\arccos\sqrt{1-x}\ln(x-x^2)\ln\left(\frac{1}{x}-1\right)dx?$
math.stackexchange.com

6
Calculate integral with help the Euler's integrals
math.stackexchange.com

6
Sum of series $n\cdot\sin x^n$
math.stackexchange.com

6
Is $9*(1/9) = 0.99999999...$ statement correct?
math.stackexchange.com

6
Choosing a substitution to evaluate $\int \frac{x+3}{\sqrt{x+2}}dx$
math.stackexchange.com

6
Find the power series representation of $e^{-x^2}$
math.stackexchange.com

5
Maclaurin series of $\ln(1-z)$
math.stackexchange.com

5
How to approximate the integral $\int_{-b}^{\infty}(t+b)^{\nu}e^{-t}e^{-e^{-t}}dt$
math.stackexchange.com

5
Can a summation of logs be simplified?
math.stackexchange.com

5
radius of convergence of Taylor expansion of $e^x$
math.stackexchange.com

1 2