<h2>AAS 97-138</h2>
<h2>A NEW LOOK AT THE PROBLEM OF CONSTRAINTS VIOLATION                                                                                               </h2>
<h4> S. Djerassi, Haifa, Israel K. W. Buffinton, Bucknell University                                                                                                          </h4>
<h2> Abstract </h2>
 The present work deals with the problem of constraints violation associated with  numerical integration of ordinary differential equations subject to constraints.  A  new method is set forth for the elimination of constraints violation.  The method  involves the definition of 'old' constraints and 'new' constraints, the removal of  the 'old' constraints and the imposition of the 'new' constraints, and the  evaluation, at each integration step, of changes in the integration variables  resulting from the removal-imposition process.  The method is shown to be superior  to the classical Baumgarte procedure for constraints violation elimination.