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The modified gravity, which eliminates the need for dark energy and whichseems to be stable, is considered. The terms with positive powers of thecurvature support the inflationary epoch while the terms with negative powersof the curvature serve as effective dark energy, supporting current cosmicacceleration. The equivalent scalar-tensor gravity may be compatible with thesimplest solar system experiments.Comment: 23 pages, 3 figures, discussion is extended, references added,  version to appear in PR

Modified gravity with negative and positive powers of curvature: Unification of inflation and cosmic acceleration