Kõiki elemente/pindasid saab liigitada seitsmesse invariantsusklassi, lähtudes vabadusastmetest, mille jaoks element/pind on invariantne (kahe või enama pinna koond kuulub ka ühte neist klassidest).
All surfaces can be classified into seven invariance classes based on the degrees of freedom for which the surface is invariant (a collection of two or more surfaces also belongs to one of these classes).
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