User ncmathsadist - Mathematics Stack Exchange

ncmathsadist

Member for 12 years, 2 months
Last seen more than a week ago

johnmmorrison.com
Chapel Hill, NC

1,704 Answers

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106 votes

Examples of patterns that eventually fail

answered Feb 21, 2012 at 0:28

87 votes

Accepted

Why is $L^{\infty}$ not separable?

answered Jan 9, 2012 at 16:21

83 votes

Surprising identities / equations

answered Sep 30, 2013 at 1:01

63 votes

Is there a mathematical symbol for "For every element"?

answered Jun 19, 2012 at 14:16

54 votes

Your favourite application of the Baire Category Theorem

answered Jul 2, 2012 at 13:55

54 votes

Prove: $\int_0^\infty \sin (x^2) \, dx$ converges.

answered Feb 3, 2012 at 1:00

53 votes

Accepted

What is the purpose of the first test in an inductive proof?

answered Dec 1, 2013 at 1:21

44 votes

Accepted

Prime factorization of 1

answered Jun 23, 2011 at 14:36

41 votes

Accepted

Why $0!$ is equal to $1$?

answered Nov 1, 2012 at 1:22

41 votes

Interesting "real life" applications of serious theorems

answered May 15, 2014 at 18:54

34 votes

Accepted

Changing a number between arbitrary bases

answered Feb 20, 2012 at 2:09

30 votes

Accepted

When do we get extraneous roots?

answered Aug 3, 2011 at 22:55

27 votes

Piecewise functions: Got an example of a real world piecewise function?

answered Jun 5, 2012 at 12:52

23 votes

Why is the complex number $z=a+bi$ equivalent to the matrix form $\left(\begin{smallmatrix}a &-b\\b&a\end{smallmatrix}\right)$

answered Aug 9, 2012 at 22:24

23 votes

Homomorphisms between fields are injective.

answered Oct 4, 2014 at 13:12

23 votes

Accepted

Summation Theorem how to get formula for exponent greater than 3

answered Jul 8, 2015 at 0:39

20 votes

Accepted

Does Bounded Covergence Theorem hold for Riemann integral?

answered May 25, 2012 at 12:32

19 votes

The square of an integer is congruent to 0 or 1 mod 4

answered Jan 17, 2012 at 1:54

19 votes

$\sqrt{x}$ isn't Lipschitz function

answered Feb 7, 2014 at 13:39

18 votes

Continuous bijection from $(0,1)$ to $[0,1]$

answered May 31, 2011 at 12:01

18 votes

Is a line parallel with itself?

answered Jun 15, 2011 at 14:49

18 votes

Accepted

Pseudo-Cauchy sequence

answered Apr 16, 2015 at 16:03

18 votes

Accepted

Inequality with (1-x) as denominator

answered Apr 22, 2015 at 12:44

17 votes

How to find a random axis or unit vector in 3D?

answered Jun 19, 2011 at 2:51

17 votes

Accepted

Is $a^{\ln b} = b^{\ln a}$?

answered Dec 18, 2015 at 2:15

16 votes

Accepted

Negative 1 to the power of Infinity

answered Jul 2, 2011 at 21:07

16 votes

Your favourite application of the Baire Category Theorem

answered Jul 2, 2012 at 14:12

16 votes

Distinct permutations of the word "toffee"

answered Jul 26, 2012 at 22:24

15 votes

Show that $\mathbb{R}/\mathbb{Z}$ is isomorphic to $\{e^{i\theta} : 0 \le \theta \le 2\pi \}$

answered Jan 10, 2013 at 0:08

15 votes

Proof that the Cantor set has measure zero.

answered Feb 27, 2013 at 2:29

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