SyTen

## ◆ vert2_norm()

 Tensor< 4 > syten::IPEPS::vert2_norm ( Vert2CTM const & env, State const & psi, Tensor< 4 > & fq, Tensor< 3 > & a, Tensor< 4 > & bq, Tensor< 3 > & b, bool gauge_fix, bool use_svd )

Calculates a rank-4 norm tensor from a vertical two-site environment and the supplied left- and right QR'ed auxiliary tensors.

The tensor can be completed using a and b and their complex conjugates to form the squared norm of the state. The vertical environment may not straddle the remover tensor.

Referenced by syten::IPEPS::FullUpdate::vertical().

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