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''Approximation of solution operators of elliptic partial differential equations by H- and H<sup>2</sup>-matrices'',
Num. Math. (2010), 115:165–193</ref>
<ref name ="FAMEPR13">M. Faustmann, J. M. Melenk and D. Praetorius,
''H-matrix approximability of the inverses of FEM matrices'',
to appear in Num. Math., preprint available at [http://arxiv.org/abs/1308.0499 arXiv.org]</ref>
a rank proportional to <math>\log(1/\epsilon)^\gamma</math> with a small constant <math>\gamma</math> is sufficient to ensure an
accuracy of <math>\epsilon</math>.
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