Marco
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 Jul2 awarded Curious Jan29 awarded Yearling Oct13 asked Can I approximate sine and cosine without derivatives? Aug12 revised A set of the plane recursively including “crosses”… edited title Aug10 comment How to expand and simplify this expression? For example: rotating 90° and then reflecting has not the same result as reflecting and then rotating 90°. Aug10 revised “Constrained” numerical solutions of ODEs with conservation laws? edited title Aug10 revised “Constrained” numerical solutions of ODEs with conservation laws? added 9 characters in body Aug10 asked “Constrained” numerical solutions of ODEs with conservation laws? Aug10 comment A set of the plane recursively including “crosses”… 1) No this is not homework and I am not a student. This is an original problem which I invented. 2) Yes you are right, I should have said "non-empty", I'm going to correct. Aug10 revised A set of the plane recursively including “crosses”… added 8 characters in body Aug10 asked A set of the plane recursively including “crosses”… Oct2 comment Continuous function from $[0,1]$ to $[0,1]$ whose fibers are infinite It would be interesting to see how the plot of such a function would look like. Oct2 awarded Yearling Sep29 comment Prove: If $\lim_{n\to\infty}a_n = L$ and $a_n > a$ for all $n$ then $L \geq a$ Suppose by contradiction that \$L