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Mathematics
Cameron Williams
Meta user
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683 Answers

Newest Activity Votes
87
Am I just not smart enough?
Oct 8 '14 at 1:49
55
Why are mathematician so interested to find theory for solving partial differential equations but not for integral equation?
Mar 18 '14 at 23:43
51
Why is it not true that $\int_0^{\pi} \sin(x)\; dx = 0$?
Oct 20 '15 at 20:00
32
Is this solution mathematically “legal”?
Aug 18 '15 at 16:40
23
$\frac1a+\frac1b+\frac1c=0 \implies a^2+b^2+c^2=(a+b+c)^2$?
Aug 3 '13 at 2:42
21
Why is zero the only infinitesimal real number?
Jun 9 '15 at 3:58
21
Why is the derivative of a vector orthogonal to the vector itself?
Feb 25 '15 at 4:37
19
Upper Bound vs. Least Upper Bound
Aug 12 '13 at 20:30
17
What is the dot product and why do we need it?
Jan 6 '14 at 18:46
17
How to prove $\exp(x)/(\exp(x)+1)^2$ is even?
Mar 21 '16 at 3:19
16
Why formulate continuity in terms of pre-images instead of image?
Jul 30 '15 at 17:06
16
Determine if the following is surjective
Apr 21 '15 at 3:51
16
$A^{-1}$ has integer entries if and only if the ${\rm det}\ (A) =\pm 1$
Apr 20 '15 at 23:51
16
What is the relation between a Banach space and a Hilbert space?
Aug 20 '13 at 16:52
14
Find $\lim\frac{1}{\sqrt{n}}\left(\frac{1}{\sqrt{1}+\sqrt{3}}+\frac{1}{\sqrt{3}+\sqrt{5}}+\ldots+\frac{1}{\sqrt{2n-1}+\sqrt{2n+1}}\right)$
Jun 23 '14 at 3:13
13
Why it's true? $\arcsin(x) +\arccos(x) = \frac{\pi}{2}$
Jan 23 '15 at 21:30
13
Importance of groups $(\mathbb R,+)$ and $(\mathbb Z,+)$ for Fourier series
Oct 7 '14 at 1:59
13
Why do you need to use the chain rule in differentiation of ln?
Feb 23 '14 at 17:12
12
Integral $\int_0^1 \log \left(\Gamma\left(x+\alpha\right)\right)\,{\rm d}x=\frac{\log\left( 2 \pi\right)}{2}+\alpha \log\left(\alpha\right) -\alpha$
May 7 '14 at 4:32
12
Solve $2^{x+5} - 2^{x+2} = 7$
Apr 23 '17 at 4:08
12
Intuition about the semidirect product of groups
Mar 19 '16 at 17:49
12
Must all Lebesgue integrable functions really be invertible?
Jul 28 '15 at 5:34
11
Show $\sum_{i=0}^\infty {k+i \choose k}a^i=\frac1{(1-a)^{k+1}}.$
Jan 4 '18 at 15:26
11
Solve equation with $x$ in the exponents
Jun 19 '14 at 23:00
10
25th derivation of $\cos{x^3}$
Aug 22 '16 at 20:44
10
If $x>0$ and $x^a=x^b$ can one assume that $a=b$?
May 16 '16 at 19:16
10
Integral of $(3-x)/(x+2)$
Jan 31 '14 at 3:19
9
Do row operations change the column space of a matrix?
Jul 28 '15 at 1:46
9
Finding a rare case where an incorrect rule works?
Jul 5 '14 at 3:14
9
Why does $\int_{-\infty}^{\infty} f(x) dx \ne \lim\limits_{t \to \infty} \int_{-t}^{t} f(x) dx$?
Jun 20 '14 at 0:25
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