inv_qr_to_back()

Tensor< 5 > syten::IPEPS::inv_qr_to_back	(	Tensor< 4 > const &	fq,
		Tensor< 3 > const &	a
	)

Recovers the original tensor from the result of qr_to_back().

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

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