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 Aug21 revised The process of solving the inequality $\frac{8}{19} x\ge -1$ corrected equations Aug21 suggested approved edit on The process of solving the inequality $\frac{8}{19} x\ge -1$ Jul10 comment How to create circles and or sections of a circle when the centre is inaccessible and your print screen button doesn't work? May19 comment Number of ways to order numbers such that greatest number proceeds smallest number which is equal to $\frac{n!}{2}$ May17 answered What did Johann Bernoulli wrong in his proof of $\ln z=\ln (-z)$? May16 comment Proving that all eigenvalues are $0$ bar one. it's sufficient to prove that all $Ax=a\mathbf{e}$ Apr17 comment Why does $n^0 = 1$? there is $$n^k = \Pi^k_{i=1}i$$ but that relies on $$\Pi^0_{i=1}i=0$$ Apr10 comment Visually deceptive “proofs” which are mathematically wrong result of the assumption that $\sqrt b \cdot \sqrt a = \sqrt{a\cdot b}$ for all reals $a$ and $b$ instead of only for positive reals Apr7 comment Visually deceptive “proofs” which are mathematically wrong all of the answers below rely on a slight bend in a diagonal line which accounts for the missing area Apr4 answered Can a coin with an unknown bias be treated as fair? Mar18 comment Minimum number of different clues in a Sudoku must resist urge to solve sudoku... Mar13 comment What is wrong in this proof? or a square of a negative number; the logarithm of a negative number, those are the most common but any multivalued function can be used Mar4 comment For all square matrices A and B of the same size, it is true that (A+B)^2 = A^2 + 2AB + B^2 @Nicholas because distributiveness works even when $AB\ne BA$ (it's not related) Feb26 comment Interesting and unexpected applications of $\pi$ isn't this the just the series expansion of $\arctan 1$? Feb25 comment What makes a limit 'go away'? $$\lim_{x\to ∞} f(x)+g(x) = \lim_{x\to ∞} f(x)+\lim_{x\to ∞}g(x)$$ when both limits exist. and $\lim_{x\to ∞} c = c$ so you can extract the $\frac{11}{7}$ from the limit and keep $\frac{e^x}{7}$ inside it. Feb6 comment Is it faster to count to the infinite going one by one or two by two? it doesn't matter how far you count, you are always just as far from infinity than when you started. Jan15 revised How to fast convert from Octal to Hexadecimal edited body Jan15 revised How to fast convert from Octal to Hexadecimal added 103 characters in body Jan15 revised How to fast convert from Octal to Hexadecimal added 103 characters in body Jan15 answered How to fast convert from Octal to Hexadecimal