Dear all, why "has" always returns false ?

Dear all, I have the following issue:

Goal is to calculate saddle, turning point, etc.

As you can see in the code above only in case of a second restart x2 is calculated correctly.

Thanks for help.

Dear all, is there a maple call to calculate the space curve connecting two points of a 3d plane?

e.g. the plane is defined by: f(x,y) = -x^2/9 + y^2/4

The two points are: P = (1,2,0), Q=(1,-1,0)

Searched: space curve laying on 3d plane connecting the two points.

Thanks

Dear all, in the example below I create a matrix(3x2) and each element contains a vector. How can I avoid the double brackets of the matrix elements or eliminate the double brackets?

Thanks for help

Dear all, in Maple Help exists the documentation of how to use the OpenMaple API Library. But I didn't found a link where to download the necessary libraries. I found e.g. the library maple-0.17.4.jar but it doesn't contain com.maplesoft.openmaple.*

http://www.java2s.com/example/jar/m/maple-index.html

Tahnks for help