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Multireference coupled-cluster (MRCC) theory using an eigenvalue-independent partitioning (EIP) technique is formulated for a general incomplete model space, taking a valence universal normal ordered wave operator Ω = {exp(S)} that acts upon the model space P. For the size-extensivity requirement the intermediate normalization is abandoned (i.e. PΩP ≠P ) and hence the closed part of Ω, Ω c ...
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