RT Journal Article T1 Stieltjes differential systems with nonmonotonic derivators A1 Frigon, Marlène A1 Fernández Tojo, Fernando Adrián K1 Stieltjes derivatives K1 Differential systems K1 Fundamental Theorem of Calculus K1 Ascoli–Arzelà Theorem K1 Fluid stratification AB In this work we study Stieltjes differential systems of which the derivators are allowedto change sign. This leads to the definition of the notion of a function of controlledvariation, a characterization of precompact sets of g-continuous functions, and anexplicit expression of g-exponential maps. Finally, we prove a Peano-type existenceresult and apply it to a model of fluid stratification on buoyant miscible jets andplumes. PB Springer YR 2020 FD 2020 LK http://hdl.handle.net/10347/21786 UL http://hdl.handle.net/10347/21786 LA eng NO Frigon, M., Tojo, F.A.F. Stieltjes differential systems with nonmonotonic derivators. Bound Value Probl 2020, 41 (2020). https://doi.org/10.1186/s13661-020-01345-0 NO Marlène Frigon was partially supported by NSERC Canada. F. Adrián F. Tojo was partially supported by Ministerio de Economía y Competitividad, Spain, and FEDER, project MTM2013-43014-P, and by the Agencia Estatal de Investigación (AEI) of Spain under grant MTM2016-75140-P, co-financed by the European Community fund FEDER DS Minerva RD 24 abr 2026