DATE     94/01/10

    Opérateur SYMT :                           See also :ANTI REAC 
    --------------                                       RESO RELA 
                                                         BLOQ TRAC 


    RIG1 = SYMT ('DEPL') ('ROTA') POIN1 POIN2 (POIN3 si 3D) GEO1 (FLOT1)


    Description :
    _____________

    The SYMT operator enables the user to impose SYMETRIE type 
 boundary conditions on the degrees of freedom in displacement
 and/or in rotation.

    Contents :
    __________

   'DEPL'    : SYMETRIE type boundary conditions on the d.o.f.
               in DEPLACEMENT.

   'ROTA'    : SYMETRIE type boundary conditions on the d.o.f.
               in ROTATION.


   IMPORTANT : At least ONE of these two specifications is COMPULSORY.
   __________


    POIN1 |  : points defining the 2D-symmetrical axis (POINT type)
    POIN2 |


    POIN1 |  : points defining the 3D-symmetrical plane (POINT type)
    POIN2 |
    POIN3 |

    GEO1     : object on which the boundary conditions are imposed
               (POINT or MAILLAGE type)

    FLOT1    : criterion of selection for the points pertaining to the
               symmetrical axis or plane (FLOTTANT type).
               By default, 1/10 of the current density is used.
               FLOT1 is thus REQUIRED when no density has been 
               defined previously

    RIG1     : symmetrical boundary conditions (RIGIDITE type)

    CAUTION    Your choice of a criterion conditions the set of points
    _________  on which the symmetrical conditions will apply.
               So it is advisable, on the one hand, to choose the
               criterion carefully, and on the other, to display the
               generated restraints by means of the TRAC operator.
              

    Note :
    ________

    DO NOT MIX UP this operator with the SYME meshing operator ||.