Dason
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 Feb 26 comment I get a wrong determinant - why? Indeed. Otherwise you'd be able to break down the determinate of a 2x2 into the sum of 4 determinants where the matrices are 0s except for 1 element (which means the determinants are 0) and you could generalize to show that all non 1x1 matrices have a determinant of 0. But that's clearly not true. Dec 31 comment Infinite primes proof @MichaelHardy But does everybody know that it's amusing? Nov 29 comment Square of a differential There are an infinite number of options that work: -ln(x) + c Mar 11 comment How to formulate that an equation be shown to have no solutions? Will people please stop trying to prove/disprove the example given. The question is given in the first line. They aren't asking you to prove/disprove that the example equation has no solutions. Jan 5 comment Sums of the form $\pm1^2\pm2^2\pm3^2\pm4^2\pm…\pm(N-1)^2\pm N^2$ Not with that attitude it's not. Jan 5 comment Sums of the form $\pm1^2\pm2^2\pm3^2\pm4^2\pm…\pm(N-1)^2\pm N^2$ @5xum - Impossible? Maybe with that attitude... Jun 4 awarded Commentator Jun 4 comment Can you give me a visual representation on 1/6 of 4/5 to get 4/30? Good job people - now you have me hungry :( Dec 2 comment Can $x^3+3x^2+1=0$ be solved using high school methods? If it gives the answer as an approximation this makes me wonder if this was one of the questions where they ask you essentially to just graph it and look at the plot to find an approximate solution. I recall having a few like that in high school... Oct 28 comment Rational + irrational = always irrational? I think they were just pointing out that you can't use a fact without proving it. With what you said how does somebody know if the fact that you're trying to use is if x + c (where c is rational) is irrational then x is irrational compared to using if x+c (where c is anything) is irrational then x is irrational. Clearly the second one is false (take c = -x). So you just need to be more clear in what you're using and only use facts that you've proven. Aug 13 comment What's 4 times more likely than 80%? Is there a specific reason for all the numbers to be in latex? It seems like the only thing it adds is rendering time... Mar 6 awarded Autobiographer Nov 23 comment Tricks to remember Fatou's lemma I do the same except let fn be an indicator that x >= n so that lim inf of the integral is infinity. Oct 1 comment using numbers 1 to 9 only once to equal 1 million @gam3 multiplication by 10 you say? 1*10*10*10*10*10*10. And do we have to use each digit 1 time? Jul 8 awarded Citizen Patrol Jun 24 awarded Editor Jun 24 revised If a function has a finite limit at infinity, does that imply its derivative goes to zero? Replaced shortened nbhd with full word Jun 24 suggested approved edit on If a function has a finite limit at infinity, does that imply its derivative goes to zero? May 13 comment What would be a good outdoor maths puzzle for children? Also there is no guarantee that you'll end up with a single loop. Feb 21 comment Examples of apparent patterns that eventually fail The chestnut being what exactly?