decontractToPhysicalBranching()

std::tuple< SRDef, STensor, STensor, STensor, SBasisId, SBasisId > syten::T3N::Contraction::decontractToPhysicalBranching	(	STensor	t,
		SBasisId const &	p,
		SBasisId const &	d,
		Truncation const &	trunc
	)

Takes a physical branching contraction and seperates it along a certain leg.

References syten::STensorImpl::demerge(), syten::STensorImpl::flip_on_tensor(), syten::IdentityDenseTensorImpl::merge(), syten::STensorImpl::svd(), SYTEN_ASSERT_DEBUG, and std::tie().

Referenced by syten::T3N::VarationalTrunc::update_2phys_branch_down(), syten::T3N::VarationalTrunc::update_2phys_branch_right(), and syten::T3N::VarationalTrunc::update_2phys_branch_up().

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