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Positive semidefinite germs in real analytic surfaces. Fernando Galván, José Francisco We find all real analytic surface germs in R3 on which every positive semidefinite function germ is a sum of squares (in fact, of two squares) of analytic function germs. 2023-06-20T16:51:19Z 2023-06-20T16:51:19Z 2023-06-20T16:51:19Z 2002 journal article https://hdl.handle.net/20.500.14352/57240 0025-5831 10.1007/s002080100264 eng PB98-0756-C02-01 Fernando, J. Positive semidefinite germs in real analytic surfaces. Math Ann 322, 49–67 (2002). https://doi.org/10.1007/s002080100264 restricted access Springer