## 150 Reputation

2 years, 216 days

## How to get the group in result of Derive...

Maple 2021
`ds := DerivedSeries(PermutationGroup({[[2, 3, 5, 4]], [[1, 2, 3, 4, 5]]}))`

will get a series group like:

How to get the group by the red line point out? Then I can use `GroupOrder` to get the order of it. I note `GroupOrder[ds[2]]` don't work

## How to calculate the area of this closed...

Maple

I am a Mathematica user actually. And I can know `x^(1/(x + 1/x)) + y^(1/(y + 1/y)) == E` is closed by the code:

`ContourPlot[x^(1/(x + 1/x)) + y^(1/(y + 1/y)) == E, {x, 0, 7}, {y, 0, 7}]`

But Mathematica cannot calculate this integral `Integrate[1,Element[{x,y},ImplicitRegion[x^(1/(x+1/x))+y^(1/(y+1/y))>=E,{{x,0,7},{y,0,7}}]]]`. It just can give a numerical solution by `NIntegrate`, This makes me depressed. So I try to calculate it by Maple. After I read some documentation of maple, I don't know how to use a implicit function to expression a region to do integral in MultiInt. So I ask here to help. Anybody can tell me how to write this code in Maple?

 1 2 3 4 5 6 Page 6 of 6
﻿