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Geometric constraint solving became an integral part of CAD systems in the 80s, when Pro/Engineer first introduced a novel concept of feature-based parametric modeling concept.<ref>{{cite book|last1=Robert Joan-Arinyo|title=Basics on Geometric Constraint Solving|citeseerx=10.1.1.331.9554}}</ref><ref>{{cite journal|last1=R. Anderl|last2=R. Mendgen|title=Modelling with constraints: theoretical foundation and application|journal=Computer-Aided Design|volume=28|issue=3|pages=155–168|doi=10.1016/0010-4485(95)00023-2|year=1996}}</ref>
There are additional problems of geometric constraint solving that are related to sets of geometric elements and constraints: dynamic moving of given elements keeping all constraints satisfied,<ref>{{cite journal|title=A constraint-based dynamic geometry system|journal=Computer-Aided Design|volume=42|issue=2|pages=151–161|last1=Marc Freixas|last2=Robert Joan-Arinyo|last3=Antoni Soto-Riera|doi=10.1016/j.cad.2009.02.016|year=2010}}</ref> detection of over- and under-constrained sets and subsets,<ref>{{cite book|last1=Rossignac|first1=Jaroslaw|last2=SIGGRAPH|first2=Joshua Turner, editors
== Methods ==
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