minthao_2011
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 Mar 30 revised How do I get my equation to have the form $(x-a)^2 + (y-b)^2 + (z-c)^2-d = 0$? added 2 characters in body Mar 30 answered How do I get my equation to have the form $(x-a)^2 + (y-b)^2 + (z-c)^2-d = 0$? Mar 24 awarded Popular Question Mar 11 awarded Notable Question Mar 10 asked Reduce and roots of an irrational inequality Feb 9 comment Calculate area under a polyline @MichaelE2 If I change the code into tmp = {{0, 0}, {1, 1}, {2, 1}, {3, 2}, {1, 6}}; plot = ListLinePlot[tmp, Filling -> Axis]; Area@DiscretizeGraphics[plot] I got the answer is 8. My maple has the same result. But your code is 6. I don't understand why? Feb 2 accepted How to convert cube root of this equation into TeX? Feb 2 asked How to convert cube root of this equation into TeX? Jan 24 accepted How can I get all solutions of a system of equations with Reduce? Jan 24 revised How can I get all solutions of a system of equations with Reduce? added 11 characters in body Jan 24 asked How can I get all solutions of a system of equations with Reduce? Jan 7 awarded Popular Question Dec 23 comment How to select a list from a list? I am sorry. I did. Dec 23 comment How to select a list from a list? If each element contains four points, for example, {{-5, -1, -1}, {-5, -1, 3}, {-5, 4, -2}, {3, -1, -5}}. I tried Select[nonright, (12 == Length[Union @@@ #] &)] it does not correct. Please help me. Dec 22 comment How to select a list from a list? Thank you very much. Dec 22 comment How to select a list from a list? @ belisarius In line Select[lst, ( 9 == Length[Union @@ #] &)] If I want 9 numbers different from 0. How can I select? Dec 21 revised How to select a list from a list? deleted 2 characters in body Dec 21 comment How to select a list from a list? Yes. I will edit my question. Dec 21 comment How to select a list from a list? You understand me. Thank you very much. Dec 21 accepted How to select a list from a list?