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Answers for “离散化误差是如何定义的?”

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The video states this as a global law for the finite element approximation: the total perimeter of the polygon formed by all the straight elements must equal the length of the approximated circle. This is the mathematical statement that follows from assembling the individual element equations.

Conditions: Applies to the assembled set of finite elements forming the approximated circle.; The equality is for the approximated polygon, not automatically the original continuous circle.