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Mathematics
Old John
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296 Answers

Newest Activity Votes
385
Can't argue with success? Looking for “bad math” that “gets away with it”
Dec 17 '12 at 11:58
71
What are some examples of notation that really improved mathematics?
Nov 7 '13 at 18:56
64
Expressing $2002^{2002}$ as a sum of cubes
Jun 26 '12 at 12:56
45
Infiniteness of non-twin primes.
Dec 20 '13 at 18:21
39
A real solution to a cubic equation
Aug 27 '13 at 2:05
39
Too old to start math
Nov 15 '12 at 0:17
36
Variation of Pythagorean triplets: $x^2+y^2 = z^3$
Mar 19 '13 at 15:51
32
How to define the $0^0$?
Dec 15 '12 at 21:15
30
“Negative” versus “Minus”
Jun 11 '12 at 21:36
29
Give an example of a noncyclic Abelian group all of whose proper subgroups are cyclic.
Aug 22 '12 at 17:15
27
Is there any nonconstant function that grows (at infinity) slower than all iterations of the (natural) logarithm?
Nov 21 '13 at 16:19
25
Evaluate $\int_0^\pi xf(\sin x)dx$
Jun 17 '12 at 8:49
21
Is there any simple method to calculate $\sqrt x$ without using logarithm
Oct 24 '13 at 10:40
21
'Linux' math program with interactive terminal?
Aug 3 '12 at 10:04
19
Example of an infinite sequence of irrational numbers converging to a rational number?
Jul 1 '12 at 8:33
19
Why is it legit to evaluate $\lim_{x\rightarrow 1} \frac{(x-1)(x+1)}{x-1}$ by cancelling common factors?
Jun 22 '12 at 7:13
18
Why the number e(=2.71828) was chosen as the natural base for logarithm functions?
Jul 29 '12 at 7:56
17
Proofs that every mathematician should know.
Aug 5 '12 at 5:46
17
Prove that there does not exist any positive integers pair $(m, n)$ satisfying: $n(n + 1)(n + 2)(n + 3) = m{(m + 1)^2}{(m + 2)^3}{(m + 3)^4}$
Jul 10 '12 at 17:05
16
What is the easy way to calculate the roots of $z^4+4z^3+6z^2+4z$?
Oct 29 '13 at 21:47
15
In plain English, why does conversion from hexadecimal to binary work so cleanly?
Dec 7 '13 at 17:12
14
Write down the sum of sum of sum of digits of $4444^{4444}$
Jul 12 '12 at 5:48
13
Conjecture similar to Fermat's Theorem.
Nov 21 '13 at 12:03
13
The Best of Dover Books (a.k.a the best cheap mathematical texts)
Apr 12 '13 at 19:57
13
What are rational integer coefficients?
Jul 18 '12 at 14:14
12
What are the coordinates of the vertices of a regular tetrahedron, relative to its centroid?
Nov 11 '13 at 17:49
12
Do we have always $f(A \cap B) = f(A) \cap f(B)$?
Jul 14 '12 at 13:14
11
Calculation of a square root of a big number
Nov 29 '13 at 10:21
11
Leading Digit of $2^{4242}$
Nov 15 '12 at 15:00
11
Can all primes be written as a Mersenne prime?
Sep 1 '12 at 14:25
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