Abstract
Penrose diagrams including the c boundary at infinity and the singularities for the Einstein, Eddington–Lemaitre, Eddington–Lemaitre–Bondi, and anti-de Sitter universes are constructed. Penrose diagrams for the Einstein, Eddington–Lemaitre, and anti-de Sitter universes have been published before, but these diagrams are incomplete in that the published diagrams do not contain the c-boundary points of the universes they are supposed to represent.
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