split_rank_4_into_mps_lnorm()

SRDef syten::MPS::split_rank_4_into_mps_lnorm	(	Tensor< 4 > &&	l4,
		Tensor< 3 > &	left_site,
		Tensor< 3 > &	right_site,
		Truncation	trunc
	)

Splits a rank-4 tensor into two rank-3 tensors in standard MPS ordering, truncating according to trunc.

     1  3               uIdx              uIdx
     |  |                |                 |
2--[  r4 ]--4  => lIdx-[ l ]-rIdx   lIdx-[ r ]-rIdx

where left_site is left-normalised.

References std::vector< T >::clear(), std::string::clear(), syten::genFuse(), syten::genSplit(), syten::MPS::State::lInt, norm(), syten::MPS::State::rIdx, syten::MPS::State::rInt, syten::split(), syten::SVD::svd(), and syten::MPS::State::uInt.

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

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