Gamboa Mutuberria, José Manuel2023-06-212023-06-2119840035-759610.1216/RMJ-1984-14-4-931https://hdl.handle.net/20.500.14352/64707engExtensions of semidefinite functionsjournal articlehttp://projecteuclid.org/euclid.rmjm/1250127378http://projecteuclid.org/open access512Fields related with sums of squares (formally real fieldsPythagorean fieldsetc.)Real ground fieldsÁlgebra1201 Álgebra