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26.15.1  Checking whether a point is on an object in the plane

See Section 27.11.1 for checking elements in 3D geometry.

The is_element command determines whether or not a point lies on a geometric object.

Examples

is_element(-1-i,line(0,1+i))
     
1           
is_element(i,line(0,1+i))
     
0           

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