12Dxx Real and complex fields

• 12D05 Polynomials: factorization
• 12D10 Polynomials: location of zeros (algebraic theorems), {For the analytic theory, See 26C10, 30C15}
• 12D15 Fields related with sums of squares (formally real fields, Pythagorean fields, etc.), See also {11Exx}
• 12D99 None of the above but in this section