





![[BIG]](../icons/zoom18.gif)
![[Normal]](../icons/zoom14.gif)
![[small]](../icons/zoom10.gif)
 Next:  1.3.4 Definition of the nodes
Up:  1.3 Main ideas
 Prev:  1.3.2 Introduction of a curve
Index
Contents
Taking the role of the sub-domain and reference numbers into account, it could be useful to change some numbers during processing. For example, when a domain exhibits some symmetries or repetitions, a primal mesh is modified by these transformations. In this case, a number given can be introduced which changes value in order to be able to define different physical conditions. For example:
Sub-domain number 1  Sub-domain number 1  (unchanged)
  Sub-domain number 1  (unchanged)
Sub-domain number 2  Sub-domain number 3 (changed)
  Sub-domain number 3 (changed)
Reference number 1  reference number 2 (changed)
  reference number 2 (changed)
Reference number 2  reference number 3 (changed)
 reference number 3 (changed)
The modification modules perform this type of operation.






![[BIG]](../icons/zoom18.gif)
![[Normal]](../icons/zoom14.gif)
![[small]](../icons/zoom10.gif)