Mathematics Subject Classification 1991

16Sxx Rings and algebras arising under various constructions ( 0 Dok. )

• 16S10 Rings determined by universal properties (free algebras, coproducts, adjunction of inverses, etc.) ( 0 Dok. )
• 16S15 Finite generation, finite presentability, normal forms (diamond lemma, term-rewriting) ( 0 Dok. )
• 16S20 Centralizing and normalizing extensions ( 0 Dok. )
• 16S30 Universal enveloping algebras of Lie algebras See mainly{ 17B35} ( 0 Dok. )
• 16S32 Rings of differential operators, See also {13N10, 32C38} ( 0 Dok. )
• 16S34 Group rings, See also {20C05, 20C07}, Laurent polynomial rings ( 0 Dok. )
• 16S35 Twisted and skew group rings, crossed products ( 0 Dok. )
• 16S36 Ordinary and skew polynomial rings and semigroup rings, See also {20M25} ( 0 Dok. )
• 16S40 Smash products of general Hopf actions, See also {16W30} ( 0 Dok. )
• 16S50 Endomorphism rings: matrix rings, See also {15-XX} ( 0 Dok. )
• 16S60 Rings of functions, subdirect products, sheaves of rings ( 0 Dok. )
• 16S70 Extensions of rings by ideals ( 0 Dok. )
• 16S80 Deformations of rings, See also {14D15} ( 0 Dok. )
• 16S90 Maximal ring of quotients, torsion theories, radicals on module categories, See also {13D30, 18E40}, {For radicals of rings, See { 16Nxx}} ( 0 Dok. )
• 16S99 None of the above but in this section ( 0 Dok. )