Alain Martel <kua### [at] videotronca> wrote:

> > Because my mathematics is not so good, so I need spend so many years to think
> > these composite(I just try something I prepare for other concept).
> >
> > The result yesterday is surprising me.
>
> That's not surprising for me. That's a formula for an ellipse that you
> got there for f_external_field.

I know, it is not strange of its appearance. I surly know (x/a)^2 + (y/b)^2 = 1
is the equation of ellipse. I just thinking about these trying of the
combination of it and f_bump. I was not so familiar with these combinations in
the past.

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