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## Re: [ff3d-users] Question to Docu

**From**: |
Stephane Del Pino |

**Subject**: |
Re: [ff3d-users] Question to Docu |

**Date**: |
Mon, 14 Apr 2008 22:23:57 +0200 |

**User-agent**: |
KMail/1.9.9 |

Hello.
Le Monday 14 April 2008, Markus Feldmann a écrit :
>* Hi All,*
>
>* i have got a Question to your Docu.*
>* I do not understand the Excercise on Page 11 in your Docu*
>* http://www.freefem.org/ff3d/docs/freefem3dDoc.pdf*
>* ?*
>* What is the Problem in this Excercise ?*
In fact there is no exercice their. It is just some kind of model
(non-physical) problem that can be solved by ff3d.
>* What means "on" and "in" ?*
- "on" says that
u=x*(x-1)+y*(y-1)+z*(z-1)
and v=sin(pi*x)*sin(pi*y)*sin(pi*z)
are verified by u and v "on" the boundary "dO" of the domain "O"
- "in" says that
-Laplacian(u)+v=f
and v-Laplacian(v)+u=g
are verified inside the domain "O" (almost everywhere in "O")
Does this answer your question?
Best regards,
Stéphane.