In this paper called "Stepping out of Homogeneity in Loop quantum Cosmology" - http://arxiv.org/pdf/0805.4585.pdf. On page 4 they say "where the sum is over the couples of distinct faces at each tetrahedron, [itex]U_{ff'} = U_f U_{f_1} U_{f_2} \dots U^{-1}_{f'}[/itex] where [itex]l_{ff'} = \{ f , f_1; f_2; \dots f^{\prime -1} \}[/itex] is the link of the oriented faces around the edge where [itex]f[/itex] and [itex]f'[/itex] join,".(adsbygoogle = window.adsbygoogle || []).push({});

Could someone clarify this for me? Possibly with diagrams?

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# Visualising the Hamiltonian constraint in inhomogeneous LQC

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