Orderings of 2-power exponent on noncommutative rings
The bulk of the paper deals with the construction of signatures of maximal proper preorderings in non-commutative rings. Also, the author establishes weak Nullstellensatz, Positivstellensatz and Nichtnegativstellensatz for orderings of 2-power exponent on non-commutative rings.
scientific article; zbMATH DE number 1398627