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A quick tour of Coupled Cluster theory

In our FCI discussion the correlation energy is defined as, with a two-body Hamiltonian, ΔE=aii|ˆf|aCai+abijij|ˆv|abCabij.

In Coupled cluster theory it becomes (irrespective of level of truncation of T) ΔE=aii|ˆf|atai+abijij|ˆv|abtabij.