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 Oct 11 awarded Yearling Sep 29 comment Is the set of all valid C++ programs countably infinite? valid c++ $\subset \Sigma^*$ and $\Sigma^*$ (all strings of alphabet $\Sigma$) is countably infinite, Jul 14 comment Where's the problem in this equation? Resulting in $4 = 5$ you could try to solve the left and right side on each line and see where it starts to differ May 13 comment Big O Notation reliability? it's still wrong $100=10^2$ so $a$ should be equal to $2$ not $100$ May 13 comment Big O Notation reliability? how do you get from $1=\frac{n^{0.001}}{100}$ to $n=10^\frac{100}{0.001}$? May 12 answered Big O Notation reliability? Apr 16 awarded Fanatic Apr 11 answered what is the best way to win: every 1000 submission will win Mar 20 answered What's the difference between tuples and sequences? Feb 22 comment Examples of apparent patterns that eventually fail @Peter not to mention that (with E a number of even kind and O of odd kind) E*E=E E*O=O O*E=O and O*O=E (just like with addition and normal odd/even in terms of mod 2) which would result in 1 being of even kind so that E*1=E and O*1=O Feb 22 comment Examples of apparent patterns that eventually fail @phkahler if you go by the fact that $1$ is not a prime then $1$ is of even kind because it has $0$ prime factors (and last I checked $0$ is even) Feb 10 revised Locally Bounded Functional Equation $f(x+y) = f(x) + f(y)$ and Continuity added 3 characters in body Feb 10 answered Locally Bounded Functional Equation $f(x+y) = f(x) + f(y)$ and Continuity Jan 30 comment Pythagorean Theorem Proof Without Words (request for words) congruent triangles at least there's a right angle and the respective adjoining it sides are equal lengths Jan 29 answered Pythagorean Theorem Proof Without Words (request for words) Jan 29 comment Which of the numbers $99^{100}$ and $100^{99}$ is the larger one? @RobertIsrael if you say $x,y \in \mathbb{N}$ then $x>2$ suffices Jan 28 comment Which of the numbers $99^{100}$ and $100^{99}$ is the larger one? it holds when $x>2$ Jan 23 comment Base ten is called “decimal”; what's the name of numbers in base 15? it has no real name you could expand the latin (or was it greek?) to other numbers (pentadecimal) but I doubt it will catch on, no-one uses base 15 or base 9 enough for it to get a name Jan 19 answered Finding location of a point on 2D plane, given the distances to three other know points Jan 18 awarded Supporter