Bradley Delso, Margarita2023-06-202023-06-201990-04-100022-404910.1016/0022-4049(90)90067-Rhttps://hdl.handle.net/20.500.14352/57160Using some model-theoretic arguments applied to the theory of real valuations, we obtain a sufficient condition based on elementary properties of , K any real closed field, for ƒ to be sum of 2mth powers of rational functions in K(x).An elementary based sufficient condition for sums of 2mth powers of polynomials over non-archimedean real closed fieldsjournal articlehttp://www.sciencedirect.com/science/article/pii/002240499090067Rmetadata only access510.63positive semidefinite polynomialssemialgebraic setssum of 2m-th powers of rational functionsLógica simbólica y matemática (Matemáticas)1102.14 Lógica Simbólica