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John Wordsworth

United Kingdom

Age: 60

I know very little about anything.

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Top Questions
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188
Can't argue with success? Looking for “bad math” that “gets away with it”
math.stackexchange.com

50
Expressing $2002^{2002}$ as a sum of cubes
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30
How to define the $0^0$?
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25
Give an example of a noncyclic Abelian group all of whose proper subgroups are cyclic.
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25
Pythagorean triplets $x^2+y^2 = z^3$
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23
Too old to start math
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21
'Linux' math program with interactive terminal?
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18
Why is it legit to evaluate $\lim_{x\rightarrow 1} \frac{(x-1)(x+1)}{x-1}$ by cancelling common factors?
math.stackexchange.com

16
Evaluate $\int_0^\pi xf(\sin x)dx$
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15
Prove that there does not exist any positive integers pair $(m, n)$ satisfying: $n(n + 1)(n + 2)(n + 3) = m{(m + 1)^2}{(m + 2)^3}{(m + 3)^4}$
math.stackexchange.com

14
Example of an infinite sequence of irrational numbers converging to a rational number?
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13
What are rational integer coefficients?
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13
Proofs that every mathematician should know?
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12
Do we have always $f(A \cap B) = f(A) \cap f(B)$?
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11
“Negative” versus “Minus”
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11
Can all primes be written as a Mersenne prime?
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10
Limit exercise from Rudin
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10
Countability of irrationals
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10
Calculating the chess problem, sum $\sum_{k=0}^{63}2^{k}$
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10
Leading Digit of $2^{4242}$
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9
Existence of Consecutive Quadratic residues
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9
Find $(x, a, b, c)$ if $x! = a! + b! + c!$
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9
A question about complex exponential
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9
Why the number e(=2.71828) was chosen as the natural base for logarithm functions?
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9
Proving that $\lim_{z \to 0} \frac{\bar{z}}{z}$ does not exist
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9
$a_n$ converges to $a$, but why $\frac{1}{n+1}(a_0+a_1+\cdots+a_n)$ also?
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9
Whether a Prime number can be written as sum of a Prime number and $2^n$?
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9
Proof that if $p\equiv3\,\left(\mbox{mod 4}\right)$ then $p$ can't be written as a sum of two squares
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8
If $p, q$, and $r$ are relatively primes, then there exist integers $x$, $y$, and $z$ such that $px + qy + rz = 1$
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8
Write down the sum of sum of sum of digits of $4444^{4444}$
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