%0 Journal Article
%A Fernando Galván, José Francisco
%T Sums of squares in real analytic rings.
%D 2002
%@ 0002-9947
%U https://hdl.handle.net/20.500.14352/57241
%X Let A be an analytic ring. We show:(1) A has finite Pythagoras number if and only if its real dimension is  2, and (2) if every positive semidefinite element of A is a sum of squares, then A is real and has real dimension 2.
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