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Published online by Cambridge University Press: 20 November 2018
In this paper, we define the notion of ${{R}_{*}}\text{-LS}$ category associated to an increasing system of subrings of $\mathbb{Q}$ and we relate it to the usual $\text{LS}$-category. We also relate it to the invariant introduced by Félix and Lemaire in tame homotopy theory, in which case we give a description in terms of Lie algebras and of cocommutative coalgebras, extending results of Lemaire-Sigrist and Félix-Halperin.