build_two_site_environment()

Tensor< 4 > syten::MPS::build_two_site_environment	(	Tensor< 2 > const &	r_cont,
		Tensor< 2 > const &	l_cont,
		Tensor< 3 > const &	local_left,
		Tensor< 3 > const &	local_right
	)

Combines two rank-2 overlap environment tensors and a two rank-3 MPS tensors into an environment tensor.

The first leg of left is connected to the left leg of left_site while the first leg of right is connected to the right leg of right_site. left_site and right_site are assumed to be in MPS ordering. The left left of right_site and the right leg of left_site are connected, with index ordering as follows:

[        ]--2       1               3      4--[        ]
[ l_cont ]          |               |         [ r_cont ]
[        ]----[ left_site ]--[ right_site ]---[        ]

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

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

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