Operas History Antiquities Chamber music Description and travel Fortification Mafia Military history, Ancient Politics and government Semantic Web Songs (High voice) with orchestra Vocal duets with orchestra Algebraic geometry -- Arithmetic problems. Diophantine geometry [See also 11Dxx, 11Gxx] -- Rigid analytic geometry Algebraic number theory Architecture and energy conservation Class field theory Commutative algebra -- Arithmetic rings and other special rings -- Dedekind, Prufer, Krull and Mori rings and their generalizations Commutative algebra -- Topological rings and modules [See also 16W60, 16W80] -- Power series rings [See also 13F25] Construction industry Dwellings End of the world Energy conservation Eye Functional analysis {For manifolds modeled on topological linear spaces, see 57Nxx, 58Bxx} -- Other (nonclassical) types of functional analysis [See also 47Sxx] -- Functional analysis over fields othe German fiction Hermits History, Military Iwasawa theory Non-Abelian groups Number theory