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These are replies submitted by mmcdara


I'm sorry not to be able to help you more.
You will have to wait for an answer from someone more experienced in these issues, I hope for you that it will not take too long.
Good luck


Impressive work, although I think it's a lot of wasted time to satisfy whims :-)
Nevertheless I vote up


Thanks acer, I am going to figure out what I can do with this.
I'm not  used to Plot Component but I think it's an option I can get by with


A new version of my first file




`Sorry for my mistaje.

PS: I like the way you did it with geom3d

@vv @tomleslie

S... you are right

thousand apologies to  @yangtheary ​​​​​​​


A variant of my last procedure where vertices and edges are highlighted and whose color is made persistent or not

@one man 


For the first plot:  the deconstruction of the form not the opposite of its construction.
It seems like a bug in animate for if you advance frame by frame (use the cursor in the animate panel) the phenomenom doesn't occur.
Just like  animate wouldn't have time to display the complete surface when the frames follow one another.

Look at the begining of the deconstruction: the cross section has a closed eight shape while it is an open shape at the end of the construction.

@Mac Dude 

Right, see my reply to @gkokovidis
I didn't read the question carefully: I read that Carrie had invested $4000 at the age of 25 and waited 30 years to get it back.
I have edited my answer.

Also, as I told the OP, I am not familiar with English financial terms, like you I guess there is a  procedure in the Finance package that does the job, but it's hard to put the finger on it


Two types of plots:

  • u versus t for a given x
  • u versus x for a given t

I don't think that 3D plots are readable, but tiy can do them by yourself if you want

This serie doesn't converge for any values of lambda and t.
What are the conditions toy put on them?
Where does x come from un U(x,t)?


Thanks, I understand better the meaning of "false" now


Hi, I don't understand where the problem is.
Here is the original file loaded and executed in Maple 2015 (only a modification concerning an ambiguity between epsilon and  varepsilon in eq2 and eq3)

I have no spurious zeroes at all ???


I keep thinking that geom3d is the easiest way to handle this kind of problem in general situations (easiest in the sense that it requires no specific mathematical knowledge [a lazy person's opinion], even if a more concise way, look @vv, can bee proposed).

Here is a procedure which treats:

  • intersecting planes
    • returns the intersection of their intersection with the line in case they are not the same
  • prallel unconfounded planes
  • confounded planes



F := proc(eqp1, eqp2, eqd)
  uses geom3d:
  plane(P1, eqp1, [x,y,z]):
  plane(P2, eqp2, [x,y,z]):
  if AreParallel(P1, P2) then
    printf("the two planes are parallel"):
    if distance(P1, P2)=0 then
      printf(" and confounded"):
    end if:
    printf("the two planes are secant\n"):
    line(PlanePlaneIntersection, [P1,P2]):
    zip((u,v) -> solve(u=s, v), eqd, [x, y, z] );
    line(MyLine, %, s):
    intersection(Q, PlanePlaneIntersection, MyLine):
    if Q <> NULL then
      return detail(Q)
      printf("The intersection of the plane and the line are different"):
    end if
  end if:
end proc:

F(16*x-2*y-11*z, 14*x-y-10*z-3, [(x-2)/3, (y-5)/2, (z-2)/4])

the two planes are secant

intersection: the two lines PlanePlaneIntersection and MyLine are the same


"[["name of the object",Q],["form of the object",line3d],["equation of the line",[x=1/2+9 _t,y=4+6 _t,z=12 _t]]]"


F(16*x-2*y-11*z, 32*x-4*y-22*z-6, [(x-2)/3, (y-5)/2, (z-2)/4])

the two planes are parallel


F(16*x-2*y-11*z, 32*x-4*y-22*z, [(x-2)/3, (y-5)/2, (z-2)/4])

the two planes are parallel and confounded


F(16*x-2*y-11*z, 14*x-y-10*z-3, [(x-2)/3, (y-5)/2, (z-2)/3])

the two planes are secant


"[["name of the object",Q],["form of the object",point3d],["coordinates of the point",[2,5,2]]]"


F(16*x-2*y-11*z, 14*x-y-10*z-3, [(x-2)/3, (y-8)/2, (z-5)/3])

the two planes are secant

intersection: the given objects do not intersect
The intersection of the plane and the line are different





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