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Tensor formats<br />
⊲ Hierarchical Tucker format<br />
(HT; Hackbusch/Kühn, Grasedyck, Kressner : Tree-tensor networks)<br />
⊲ Tucker format (Q: MCTDH(F))<br />
U(x1, .., x d) =<br />
{1,2,3,4,5}<br />
1 2 3 4<br />
5<br />
r1�<br />
. . .<br />
k1=1<br />
r d�<br />
k d =1<br />
B(k1, .., k d)<br />
d�<br />
Ui(ki, xi) i=1