John Wordsworth

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I know very little about anything.


155 Answers

newest activity votes
189
Can't argue with success? Looking for “bad math” that “gets away with it”
50
Expressing $2002^{2002}$ as a sum of cubes
30
How to define the $0^0$?
25
Pythagorean triplets $x^2+y^2 = z^3$
25
Give an example of a noncyclic Abelian group all of whose proper subgroups are cyclic.
23
Too old to start math
21
'Linux' math program with interactive terminal?
18
Why is it legit to evaluate $\lim_{x\rightarrow 1} \frac{(x-1)(x+1)}{x-1}$ by cancelling common factors?
16
Evaluate $\int_0^\pi xf(\sin x)dx$
15
Prove that there does not exist any positive integers pair $(m, n)$ satisfying: $n(n + 1)(n + 2)(n + 3) = m{(m + 1)^2}{(m + 2)^3}{(m + 3)^4}$
14
Example of an infinite sequence of irrational numbers converging to a rational number?
13
Proofs that every mathematician should know?
13
What are rational integer coefficients?
12
Do we have always $f(A \cap B) = f(A) \cap f(B)$?
11
Can all primes be written as a Mersenne prime?
11
“Negative” versus “Minus”
10
Leading Digit of $2^{4242}$
10
Calculating the chess problem, sum $\sum_{k=0}^{63}2^{k}$
10
Countability of irrationals
10
Limit exercise from Rudin
9
Proof that if $p\equiv3\,\left(\mbox{mod 4}\right)$ then $p$ can't be written as a sum of two squares
9
Whether a Prime number can be written as sum of a Prime number and $2^n$?
9
$a_n$ converges to $a$, but why $\frac{1}{n+1}(a_0+a_1+\cdots+a_n)$ also?
9
Proving that $\lim_{z \to 0} \frac{\bar{z}}{z}$ does not exist
9
Why the number e(=2.71828) was chosen as the natural base for logarithm functions?
9
A question about complex exponential
9
Find $(x, a, b, c)$ if $x! = a! + b! + c!$
9
Existence of Consecutive Quadratic residues
8
Favorite problems that lead to interesting diophantine equations?
8
Write down the sum of sum of sum of digits of $4444^{4444}$
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