Stack Exchange

MJD

Philadelphia, USA

http://blog.plover.com/

I am Mark Dominus, an amateur.

I have a blog that often carries articles about mathematics.

You can email me at mjd@plover.com.

top accounts reputation activity favorites subscriptions
Top Questions
148 votes

Proof that ${\left(\pi^\pi\right)}^{\pi^\pi}$ (and now $\pi^{\left(\pi^{\pi^\pi}\right)}$ is a noninteger

number-theory numerical-methods arithmetic asked May 13 '13 at 19:47
math.stackexchange.com

115 votes

Why does mathematical convention deal so ineptly with multisets?

notation terminology math-history multisets asked May 31 '12 at 21:20
math.stackexchange.com

103 votes

Why are the solutions of polynomial equations so unconstrained over the quaternions?

abstract-algebra polynomials roots quaternions division-algebras asked Mar 21 '12 at 14:42
math.stackexchange.com

77 votes

Is the notorious $n^2 + n + 41$ prime generator the last of its type?

number-theory asked Jan 28 '13 at 23:08
math.stackexchange.com

53 votes

How can I show that $\sqrt{1+\sqrt{2+\sqrt{3+\sqrt\ldots}}}$ exists?

sequences-and-series limits nested-radicals asked Jul 6 '13 at 3:19
math.stackexchange.com

44 votes

Why does the Hilbert curve fill the whole square?

real-analysis reference-request examples-counterexamples fractals asked May 6 '12 at 22:19
math.stackexchange.com

39 votes

Who discovered this number-guessing paradox?

probability reference-request math-history paradoxes asked Mar 12 '14 at 21:06
math.stackexchange.com

38 votes

What is the Coxeter diagram for?

geometry reference-request notation polyhedra coxeter-groups asked Apr 1 '14 at 20:48
math.stackexchange.com

35 votes

Is there a rational number between any two irrationals?

real-analysis irrational-numbers rational-numbers asked Jun 16 '13 at 2:17
math.stackexchange.com

31 votes

Dividing a square into equal-area rectangles

combinatorics geometry recreational-mathematics discrete-geometry tiling asked Apr 12 '12 at 5:12
math.stackexchange.com

1 2 3 4 5 … 9

Top Answers
554
In simple English, what does it mean to be transcendental?
math.stackexchange.com

212
Find a prime factor of $7999973$ without a calculator
math.stackexchange.com

180
Examples of bijective map from $\mathbb{R}^3\rightarrow \mathbb{R}$
math.stackexchange.com

161
'Obvious' theorems that are actually false
math.stackexchange.com

151
'Obvious' theorems that are actually false
math.stackexchange.com

142
Examples of mathematical discoveries which were kept as a secret
math.stackexchange.com

138
In the history of mathematics, has there ever been a mistake?
math.stackexchange.com

137
What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
math.stackexchange.com

117
On “familiarity” (or How to avoid “going down the Math Rabbit Hole”?)
math.stackexchange.com

113
'Obvious' theorems that are actually false
math.stackexchange.com

104
Examples of mathematical results discovered “late”
math.stackexchange.com

103
Nice examples of groups which are not obviously groups
math.stackexchange.com

94
'Obvious' theorems that are actually false
math.stackexchange.com

81
Are there periodic functions without a smallest period?
math.stackexchange.com

80
How were 'old-school' mathematics graphics created?
math.stackexchange.com

80
Mathematicians ahead of their time?
math.stackexchange.com

78
Help: rules of a game whose details I don't remember!
math.stackexchange.com

77
Is “$a + 0i$” in every way equal to just “$a$”?
math.stackexchange.com

74
Why is ${x^{\frac{1}{2}}}$ the same as $\sqrt x $?
math.stackexchange.com

74
Why not to extend the set of natural numbers to make it closed under division by zero?
math.stackexchange.com

69
What is a simple example of an unprovable statement?
math.stackexchange.com

69
How can a mug and a torus be equivalent if the mug is chiral?
math.stackexchange.com

64
Must a monotone function have a monotone derivative?
math.stackexchange.com

63
'Obvious' theorems that are actually false
math.stackexchange.com

61
Are there any examples of non-computable real numbers?
math.stackexchange.com

56
Why is $\sqrt{8}/2$ equal to $\sqrt{2}$?
math.stackexchange.com

55
Why is union sign not allowed to denote intervals of function increasing?
math.stackexchange.com

51
What are well-defined functions?
math.stackexchange.com

51
Solve $\cos^2x-\sin^2x= 1$
math.stackexchange.com

48
Negating A Mathematical Statement
math.stackexchange.com

1 2 3 4 5 … 10