build_ctr_overlap_left()

Tensor< 2 > syten::MPS::build_ctr_overlap_left	(	Tensor< 2 > const &	left,
		Tensor< 3 > const &	lower,
		Tensor< 3 > const &	upper
	)

Combines upper and lower with the existing left-contraction to form a new left contraction.

The second leg of left will be connected to the left leg of upper, the first leg of left will be connected to the left leg of lower. upper and lower are assumed to be in MPS::State ordering.

References syten::MPS::State::lIdx, syten::MPS::State::rIdx, and syten::MPS::State::uIdx.

Referenced by orthogonalise_variational(), orthogonalise_variational_two_site(), and syten::MPS::State::truncateVariational().

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