Fernando Galván, José FranciscoRuiz Sancho, Jesús María2023-06-202023-06-2020020030-873010.2140/pjm.2002.205.109https://hdl.handle.net/20.500.14352/57239We show that any positive semidefinite analytic function germ on the cone z(2) = x(2) + y(2) is a sum of two squares of analytic function germs.engjournal articlehttp://msp.berkeley.edu/pjm/2002/205-1/pjm-v205-n1-p05-s.pdfhttp://msp.org/open access517.98512.7Analytic function germsAnálisis funcional y teoría de operadoresGeometria algebraica1201.01 Geometría Algebraica