return ratiorevenuerevenue accountrevenue taxreversalreversal cost methodreversereverse curvereverse lexicographicalreverse lexicographical orderreverse orderreverse processreverse the arrowsreverse to back toreversed sequencereverselyreversibereversibilityreversibility principlereversiblereversible embrittlementreversible enginereversionrevertreverting a seriesreviewrevise simplex methodrevised simplexrevised simplex algorithmrevisionrevivifyrevolutionrevolverevolving fundrewardrewritingrhombrhombicrhombohedronrhomboidrhombusrhomobidalribriccati equationricci tensorridgeriemann christoffel tensorriemann conditionriemann continuation theoremriemann function of the cauchy pro