inv_qr_to_back_r()

std::tuple< Tensor< 5 >, Tensor< 3 > > syten::IPEPS::inv_qr_to_back_r	(	Tensor< 5 >	aux,
		Tensor< 3 >	a,
		Truncation const &	trunc
	)

Reconstructs the lower state tensor at position [0,-1] and the remover on the backward link from the auxiliary tensor containing the remover physical index and the physical bond tensor constructed in qr_to_back_r.

The truncation for now only works as a simple-update procedure, but there should be no truncation for U(1) symmetries anyways.

References syten::gM(), syten::insertIOFullHalf(), syten::insertSwap(), syten::logGD(), std::move(), and syten::SVD::svd().

Referenced by syten::IPEPS::FullUpdate::vertical().

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