Stack Exchange

Ahmed S. Attaalla

I put my headphones in and indulge in the world of mathematics. Class of 2017 , Culver City High School. Class of 2021, University of California, Irvine.

top accounts reputation activity favorites subscriptions
Top Questions
25 votes

How to know whether Lagrange multipliers gives maximum or minimum?

calculus multivariable-calculus optimization lagrange-multiplier asked Dec 30 '16 at 1:26
math.stackexchange.com

20 votes

Why does gravity act at the center of mass?

homework-and-exercises newtonian-mechanics newtonian-gravity asked Apr 26 '17 at 0:29
physics.stackexchange.com

12 votes

An application of the Inclusion Principle to Chemistry? (Proof Verification)

combinatorics proof-verification inclusion-exclusion chemistry asked Nov 28 '17 at 23:26
math.stackexchange.com

11 votes

How to evaluate $\int_0^1\int_0^1 \frac{1}{1-xy} \, dy \, dx$ to prove $\sum_{n=1}^{\infty} \frac{1}{n^2}=\frac{\pi^2}{6}$.

calculus multivariable-calculus riemann-zeta asked Aug 6 '16 at 17:42
math.stackexchange.com

10 votes

Sequence related to solutions of the equation $x^x=c$

sequences-and-series limits lambert-w asked Jan 4 '16 at 4:42
math.stackexchange.com

9 votes

Evaluate $\sum_{n=0}^{\infty} \frac{n!}{(n^2)!}$

calculus sequences-and-series asked Aug 7 '16 at 18:02
math.stackexchange.com

8 votes

Nonlinear spring $F=-kx^3$

homework-and-exercises newtonian-mechanics spring asked May 8 '17 at 1:30
physics.stackexchange.com

7 votes

Using the digits $1-9$ each only once find the closest sum to $1000$.

recreational-mathematics asked Jan 11 '17 at 21:12
math.stackexchange.com

6 votes

Descartes rule of signs for Taylor Series.

calculus algebra-precalculus asked Jan 20 '17 at 0:24
math.stackexchange.com

6 votes

How do I recognize when my approach is over-counting, and how to avoid it?

combinatorics asked Jul 5 '17 at 21:36
math.stackexchange.com

1 2 3

Top Answers
26
Is there a unique polynomial function $f(x)$ of degree $\lt n$ such that $f(n) = a_n$ where $\{a_n\}$ is a sequence?
math.stackexchange.com

18
An irrational number $x$ such that $x^x$ is rational
math.stackexchange.com

16
Prove the theorem on analytic geometry in the picture.
math.stackexchange.com

15
How do I prove that powers of 5 are the sum of two squares using mathematical induction
math.stackexchange.com

13
What does this series converge to, if anything?
math.stackexchange.com

13
$x+\ln(x)=0$, what is $x$?
math.stackexchange.com

12
Find the sum of an alternating, non-geometric series
math.stackexchange.com

11
Does there exist $a \in \mathbb{Q}$ such that $a^2 - a + 1$ is a square?
math.stackexchange.com

10
Integration of Sinc function
math.stackexchange.com

10
Does this pattern have anything to do with derivatives?
math.stackexchange.com

10
Sum $\frac {1}{9} + \frac {1}{18} +\frac {1}{30} +\frac {1}{45} +\frac {1}{63} \ldots$
math.stackexchange.com

9
Inverse of a factorial
math.stackexchange.com

8
Is there a formulaic way to go from $\sum_{k=1}^{n} \frac{1}{k}$ back to $n$?
math.stackexchange.com

8
Solve $\lim_{n\to \infty} \int_{0}^{\pi\over3} {{\sin^nx}\over \sin^nx+\cos^nx}dx$
math.stackexchange.com

8
Finding out the limit $\lim_{a \to \infty} \frac{f(a)\ln a}{a}$
math.stackexchange.com

8
Power term calculated from preceding terms
math.stackexchange.com

8
How to show this fraction is equal to 1/2?
math.stackexchange.com

8
Find integral $\int_0^1 \frac{\ln x}{1 - x^2} \mathrm{d}x$
math.stackexchange.com

7
Double Integral : $\int^{1}_{0}\int^{1}_{\sqrt{y}}e^{x^3}dxdy$ without $\Gamma$ function.
math.stackexchange.com

7
Why does combining $\int_{-\infty}^{\infty} e^{-x^2} dx\int_{-\infty}^{\infty} e^{-y^2} dy$ into a $dx\,dy$ integral work?
math.stackexchange.com

7
What is $\int_0^1\frac{x^7-1}{\log(x)}\mathrm dx$?
math.stackexchange.com

7
How to solve this logarithmic equation through algebraic manipulation?
math.stackexchange.com

6
Find $\sum_{n=1}^{\infty}$ $\frac{n^{2}}{\left(n+1\right)\left(n+2\right)\left(n+3\right)\left(n+4\right)}$
math.stackexchange.com

6
Find the sum of the infinite series $1+ \frac{1}{2!}+ \frac{1}{4!}+\dotsb$
math.stackexchange.com

6
How to calculate $5^{2003}$ mod $13$
math.stackexchange.com

6
Finding the $ \int_0^\infty x^n \theta e^{-x\theta}dx$
math.stackexchange.com

6
Definite integral of $\int_{0}^{\pi}{\frac{dx}{1+\sin^2x}}$ with u-substitution?
math.stackexchange.com

6
Notation for every odd integer number
math.stackexchange.com

6
Find the limit of the following expression:
math.stackexchange.com

6
Formula for $1^k+2^k+3^k…n^k$ for $n,k \in \mathbb{N}$
math.stackexchange.com

1 2