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Old John
  • Member for 10 years, 2 months
  • Last seen more than a month ago
  • United Kingdom
425 votes

Can't argue with success? Looking for "bad math" that "gets away with it"

74 votes

What are some examples of notation that really improved mathematics?

65 votes
Accepted

Expressing $2002^{2002}$ as a sum of cubes

45 votes

Too old to start math

45 votes

Infiniteness of non-twin primes.

40 votes
Accepted

A real solution to a cubic equation

35 votes

Variation of Pythagorean triplets: $x^2+y^2 = z^3$

34 votes
Accepted

"Negative" versus "Minus"

33 votes
Accepted

Give an example of a noncyclic Abelian group all of whose proper subgroups are cyclic.

31 votes
Accepted

How to define the $0^0$?

31 votes
Accepted

Is there any nonconstant function that grows (at infinity) slower than all iterations of the (natural) logarithm?

30 votes
Accepted

Evaluate $\int_0^\pi xf(\sin x)dx$

22 votes

Is there any simple method to calculate $\sqrt x$ without using logarithm

21 votes

Example of an infinite sequence of irrational numbers converging to a rational number?

21 votes

'Linux' math program with interactive terminal?

19 votes

Proofs that every mathematician should know.

19 votes
Accepted

Why is it legit to evaluate $\lim_{x\rightarrow 1} \frac{(x-1)(x+1)}{x-1}$ by cancelling common factors?

18 votes
Accepted

Why the number e(=2.71828) was chosen as the natural base for logarithm functions?

17 votes

Prove that there does not exist any positive integers pair $(m, n)$ satisfying: $n(n + 1)(n + 2)(n + 3) = m{(m + 1)^2}{(m + 2)^3}{(m + 3)^4}$

17 votes
Accepted

Write down the sum of sum of sum of digits of $4444^{4444}$

17 votes
Accepted

What is the easy way to calculate the roots of $z^4+4z^3+6z^2+4z$?

15 votes

In plain English, why does conversion from hexadecimal to binary work so cleanly?

14 votes

The Best of Dover Books (a.k.a the best cheap mathematical texts)

14 votes

Do we have always $f(A \cap B) = f(A) \cap f(B)$?

13 votes

What are rational integer coefficients?

13 votes
Accepted

What is the prerequisite knowledge for learning Galois theory?

13 votes
Accepted

Conjecture similar to Fermat's Theorem.

12 votes
Accepted

What are the coordinates of the vertices of a regular tetrahedron, relative to its centroid?

12 votes

How to find the equation of a line, tangent to a circle, that passes through a given external point

12 votes

Big List of Fun Math Books

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