build_exchange_tensors_below()

Pair< Tensor< 4 >, Tensor< 4 > > syten::MPS::build_exchange_tensors_below	(	Basis const &	a,
		Basis const &	b,
		Basis const &	vac,
		std::vector< Pair< Index, Index > > const &	fermions
	)

Behaves the same as build_exchange_tensors_above(), except that it constructs the tensors for application from below; hence also requires outgoing bases a, b to be supplied.

References syten::MPS::Operator::dInt, syten::Basis::dir, syten::Basis::flipped(), syten::genFuse(), syten::genIINode(), syten::genOONode(), syten::genSplit(), syten::Tensor< rank >::getBasis(), syten::Inc, syten::MPS::Operator::lInt, std::make_pair(), std::move(), syten::Out, syten::MPS::Operator::rInt, syten::split(), SYTEN_ASSERT, and syten::MPS::Operator::uInt.

Referenced by build_exchange_mpo_below(), and switch_sites().

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