MJD

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bio website blog.plover.com
location Philadelphia, USA
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I am Mark Dominus, an amateur.

I have a blog that often carries articles about mathematics.


498 Answers

newest activity votes
66
What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
62
In the history of mathematics, has there ever been a mistake?
50
Must a monotone function have a monotone derivative?
46
Solve $\cos^2x-\sin^2x= 1$
30
Why is $\sqrt{8}/2$ equal to $\sqrt{2}$?
29
Can you construct a field with 6 elements?
26
Why does the logarithm require a special notation?
23
Probability of random integer's digits summing to 12
22
Nice examples of groups which are not obviously groups
21
bijective map from $\mathbb{R}^3\rightarrow \mathbb{R}$
19
“A proof that algebraic topology can never have a non self-contradictory set of abelian groups” - Dr. Sheldon Cooper
19
Research done by high-school students
19
Why not to extend the set of natural numbers to make it closed under division by zero?
16
What would base $1$ be?
16
Does $x/yz$ mean $x/(yz)$ or $(x/y)z$?
16
Importance of Axiom of Choice
15
Mathematics, Philosophy and writing.
15
Is there no solution to the “hardest” puzzle?
15
Linear Regression?
15
Big List of Fun Math Books
15
Solving SAT by converting to disjunctive normal form
14
“Include $\mathbb{R}^n$ into $\mathbb{S}^n$”
14
How does one give a mathematical talk?
13
Finite Sum of Power?
13
Finding the divisors of a number
12
What is the point of countable vs. uncountable sets?
12
Does ((2^2)^2)^2… = 1 or 0?
12
Fireworks under inverse-cube gravity
12
Past coin tosses affect the latest one if you know about them?
11
Order of $D_4$ is $4$ or $8$?
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