16S35 Twisted and skew group rings, crossed products

16S36 Ordinary and skew polynomial rings and semigroup rings [See also <a href="#code:20M25">20M25</a>]

16S38 Rings arising from non-commutative algebraic geometry [See also <a href="#code:14A22">14A22</a>]

16S40 Smash products of general Hopf actions [See also <a href="#code:16T05">16T05</a>]

16S50 Endomorphism rings; matrix rings [See also <a href="#code:15-XX">15-XX</a>]

16S60 Rings of functions, subdirect products, sheaves of rings

16S80 Deformations of rings [See also <a href="#code:13D10">13D10</a>, <a href="#code:14D15">14D15</a>]

16S85 Rings of fractions and localizations [See also <a href="#code:13B30">13B30</a>]

16S90 Torsion theories; radicals on module categories [See also <a href="#code:13D30">13D30</a>, <a href="#code:18E40">18E40</a>] {For radicals of rings, see <a href="#code:16Nxx">16Nxx</a>}

16S99 None of the above, but in this section

16Txx Hopf algebras, quantum groups and related topics

16T05 Hopf algebras and their applications [See also <a href="#code:16S40">16S40</a>, <a href="#code:57T05">57T05</a>]

16T20 Ring-theoretic aspects of quantum groups [See also <a href="#code:17B37">17B37</a>, <a href="#code:20G42">20G42</a>, <a href="#code:81R50">81R50</a>]

16T99 None of the above, but in this section

16U20 Ore rings, multiplicative sets, Ore localization

16U70 Center, normalizer (invariant elements)

16U99 None of the above, but in this section

16Wxx Rings and algebras with additional structure

16W10 Rings with involution; Lie, Jordan and other nonassociative structures [See also <a href="#code:17B60">17B60</a>, <a href="#code:17C50">17C50</a>, <a href="#code:46Kxx">46Kxx</a>]

16W22 Actions of groups and semigroups; invariant theory

16W25 Derivations, actions of Lie algebras

16W55 “Super” (or “skew”) structure [See also <a href="#code:17A70">17A70</a>, <a href="#code:17Bxx">17Bxx</a>, <a href="#code:17C70">17C70</a>] {For exterior algebras, see <a href="#code:15A75">15A75</a>; for Clifford algebras, see <a href="#code:11E88">11E88</a>, <a href="#code:15A66">15A66</a>}