Central Asia   958  
central extensions and Schur multipliers   19C09  
central limit and other weak theorems   60F05  
central tendency # measures of    519.533  
centralizing and normalizing extensions   16S20  
centrifugal and centripetal forces   531.35  
centripetal forces # centrifugal and    531.35  
century # twenty-first    01A61  
certain and probability   121.63  
Ces\`aro, Euler, N\"orlund and Hausdorff methods   40G05  
chain complexes   18G35  
chain complexes   55U15  
chain conditions on annihilators and summands: Goldie type conditions   16P60  
chain conditions on other classes of submodules, ideals, subrings, etc.; coherence   16P70  
chain conditions, complete algebras   06E10  
chain conditions, finiteness conditions   13Exx  
chain conditions, growth conditions, and other forms of finiteness   16Pxx  
chains # computational Markov    65C40  
chains # computational methods in Markov    60J22  
chains # other classes of groups defined by subgroup    20F22  
chains (nests) of projections or of invariant subspaces, integrals along chains, etc.   47A46  
chains and lattices of subgroups, subnormal subgroups   20E15  
chains with continuous parameter # Markov    60J27  
chains with discrete parameter # Markov    60J10  
chambers # in ionization    539.772  
chambers # in Wilson cloud    539.777  
change   116  
change   123.3  
change of topology, comparison of topologies, lattices of topologies) # several topologies on one set (   54A10  
changes (phase transformation) # phase    530.474  
changes (phase transformations) # phase    530.414  
changes (phase transformations) # phase    530.424  
channel models   94A40  
channels # flow through open and closed    532.54  
chaos # numerical    65P20  
chaos # quantum    81Q50  
chaotic behavior   74H65  
chaotic behavior) # transition to stochasticity (   70K55  
chaotic) behavior of solutions # complex (   34K23  
character groups and dual objects   43A40  
character recognition (OCR) # optical    006.424  
character sums # estimates on    11L40  
character sums # exponential sums and    11Lxx  
character sums # Jacobsthal and Brewer sums; other complete    11L10  
character sums and Gauss sums # other    11T24  
characteristic $p$ # zeta and $L$-functions in    11M38  
characteristic $p$ (gamma functions etc.) # special functions in    33E50  
characteristic $p$ methods (Frobenius endomorphism) and reduction to characteristic $p$; tight closure   13A35  
characteristic $p$; tight closure # characteristic $p$ methods (Frobenius endomorphism) and reduction to    13A35  
characteristic and Lyapunov exponents   34D08  
characteristic classes and numbers   57R20  
characteristic functions; other transforms   60E10  
characteristics # method of    65M25  
characteristics # particle    539.725  
characteristics of sound   534.3  
characteristics of the continuum # cardinal    03E17  
characteristics phenomena # magnetic substances and their    538.4  
characterization and structure theory   62E10  
characterization and structure theory   62H05  
characterization of arithmetic functions # other results on the distribution of values or the    11N64  
characterization of Bayes procedures # Bayesian problems;    62C10  
characterization of types of graphs # structural    05C75  
characterization theorems   20B10  
characterization, reconstruction, etc.) # signal theory (   94A12  
characterizations of $E^3$ and $S^3$ (Poincar\'e conjecture)   57M40  
characterizations of Hilbert spaces   46C15  
characterizations of particular spaces # topological    54F65  
characters # modular representations and    20C20  
characters # ordinary representations and    20C15  
charge and potential # electric    537.21  
charge waves # space    78A20  
charged particles # motion of    78A35  
chemical and reactive effects   74F25  
chemical crystallography   548.3  
chemical kinetics   80A30  
chemical reactions   541.39  
chemical structure   74E40  
chemically reacting flows   80A32  
chemistry   92Exx  
chemistry # phsical and theoretical    541  
chemistry # physical    541.3  
chemistry # quantum    541.28  
chemistry # solution    541.34  
chemistry # surface    541.33  
chemistry # theoretical    541.2  
chemistry & allied sciences   540  
chemistry (general)   80A50  
chemotaxis, etc.) # cell movement (   92C17  
China   931  
China   01A25  
China and adjacent areas   951  
choice   511.65  
choice # social    91B08  
choice and related propositions # axiom of    03E25  
choice problems (subsets, representatives, permutations) # combinatorial    05A05  
Choquet theory # convex sets in topological linear spaces;    46A55  
Chow and Hilbert schemes) # parametrization (   14C05  
Chow groups and rings   14C15  
christian social and ecclesiastical theology   260  
christianity and science   261.55  
christianity and secular disciplines   261.5  
chromatic theory of graphs and maps   05C15  
chromatic) spectroscopy # light (   535.843  
circle # maps of the    37E10  
circle geometry   516.184  
circle packings and conformal approximations   52C26  
circuit theory # analytic    94C05  
circuits, networks   94Cxx  
class field theory   11R37  
class field theory # generalized    19F05  
class field theory # geometric    11G45  
class field theory; $p$-adic formal groups   11S31  
class groups   13C20  
class groups and Picard groups of orders   11R65  
class groups, Bernoulli objects, etc.) # cyclotomic function fields (   11R60  
class numbers of quadratic and Hermitian forms   11E41  
class numbers, class groups, discriminants   11R29  
class results # complete    62C07  
classes # approximation by other special function    41A30  
classes # axiomatic model    08C10  
classes # conjugacy    20E45  
classes # distribution of integers in special residue    11N69  
classes # H^p$-   30D55  
classes # Lipschitz (H\"older)    26A16  
classes # optimal solutions belonging to restricted    49K30  
classes (hierarchies, relations among complexity classes, etc.) # complexity    68Q15  
classes (Lipschitz controls, bang-bang controls, etc.) # optimal solutions belonging to restricted    49J30  
classes and numbers # characteristic    57R20  
classes of algebras # other    08Cxx  
classes of architectures # algorithms for specific    65Y10  
classes of entire functions and growth estimates # special    30D15  
classes of functions # quasi-analytic and other    30D60  
classes of groups defined by subgroup chains # other    20F22  
classes of linear operators # special    47Bxx  
classes of models # properties of    03C52  
classes of modules and ideals # other    16D80  
classes of sets (Borel fields, $\sigma$-rings, etc.), measurable sets, Suslin sets, analytic sets   28A05  
classes of solutions; algebraically special solutions, metrics with symmetries   83C20  
classes of submodules, ideals, subrings, etc.; coherence # chain conditions on other    16P70  
classes of univalent and multivalent functions (starlike, convex, bounded rotation, etc.) # special    30C45  
classes of vector space bundles, $K$-theory # stable    55R50  
classes, universal algebra # equational    03C05  
classical algebraic geometry # questions of    51N35  
classical almost periodic functions, mean periodic functions   42A75  
classical analysis # martingales and    60G46  
classical and celestial mechanics # dynamical systems in    37N05  
classical aspects) # superfluids (   76A25  
classical Banach spaces in the general theory   46B25  
classical combinatorial problems   05Axx  
classical differential geometry   53Axx  
classical dynamic and nonequilibrium statistical mechanics (general)   82C05  
classical equilibrium statistical mechanics (general)   82B05  
classical field theories   70Sxx  
classical field theories # quantum field theory; related    81Txx  
classical first-order logic   03B10  
classical first-order model theory # other    03C68  
classical flows, reactions, etc.   92E20  
classical functions # elementary    33Bxx  
classical geometry   516.02  
classical groups   11E57  
classical groups # combinatorial problems concerning the    05E15  
classical groups # geometry of    51N30  
classical groups (geometric aspects)   14L35  
classical groups) # linear algebraic groups (   20Gxx  
classical hypergeometric functions, $_2F_1$   33C05  
classical linear elasticity   74B05  
classical logic (including intuitionistic logic) # subsystems of    03B20  
classical measure theory   28Axx  
classical mechanics; solid mechanics   531  
classical operational calculus   44A45  
classical problems, Schubert calculus   14N15  
classical propositional logic   03B05  
classical real and complex cohomology   14F25  
classical set theory (including functions, relations, and set algebra) # other    03E20  
classical set theory and its fragments # axiomatics of    03E30  
classical stabilities (Lagrange, Poisson, $L^p, l^p$, etc.) # Lyapunov and other    93D05  
classical statistical mechanics (Boltzmann statistics)   530.132  
classical theories (including reverse mathematics) # foundations of    03B30  
classical thermodynamics, heat transfer   80-XX  
classical thermodynamics, including relativistic   80A10  
classical topics   55Mxx  
classics # collected or selected works; reprintings or translations of    01A75  
Classification # Dewey Decimal    024.431  
classification   55R15  
classification # structure and    16D70  
classification # subfactors and their    46L37  
classification and discrimination; cluster analysis   62H30  
classification of affine varieties   14R05  
classification of homotopy type   55P15  
classification of infinite or finite groups # structure and    20Exx  
classification of mappings   55S37  
classification of real functions; Baire classification of sets and functions   26A21  
classification of sets and functions # classification of real functions; Baire    26A21  
classification of simple and nonsolvable groups   20D05  
classification of specific disciplines and subjects   024.46  
classification systems # general    024.43  
classification theorems   32Q57  
classification theory of Riemann surfaces   30F20  
classification theory, stability and related concepts   03C45  
classification, Hauptvermutung # comparison of PL-structures:    57Q25  
classification, hierarchies; isomonodromic deformations # Painlev\'e and other special equations;    34M55  
classification; finite determinacy of map germs   58K40  
classifications of $C^*$-algebras, factors   46L35  
classifying spaces # maps between    55R37  
classifying spaces for foliations; Gelfand - Fuks cohomology   57R32  
classifying spaces for pseudogroup structures (Spencer, Gelfand - Fuks, etc.) # cohomology of    58H10  
classifying spaces of groups and $H$-spaces   55R35  
classifying spaces, characteristic classes # homology of    55R40  
classroom # manipulative materials and their use in the    97U60  
classroom techniques. lesson preparation. educational principles # teaching methods and    97D40  
Clifford algebras # quadratic spaces;    11E88  
Clifford algebras, spinors   15A66  
close-to-elliptic equations   35Hxx  
closed and approximate solutions to the Schr\"odinger, Dirac, Klein - Gordon and other quantum-mechanical equations   81Q05  
closed categories (closed monoidal and Cartesian closed categories, etc.)   18D15  
closed categories, etc.) # closed categories (closed monoidal and Cartesian    18D15  
closed channels # flow through open and    532.54  
closed form # solutions in    35C05  
closed graph theorems; completeness (including $B$-, $B_r$-completeness) # open mapping and    46A30  
closed ground fields # other nonalgebraically    14G27  
closed monoidal and Cartesian closed categories, etc.) # closed categories (   18D15  
closed or monoidal categories) # enriched categories (over    18D20  
closed rings, related rings (Japanese, etc.) # integral closure of rings and ideals; integrally    13B22  
closed singly generated operator algebras # dual algebras; weakly    47L45  
closed'' spaces # P$-minimal'' and ``$P$-   54D25  
closure # characteristic $p$ methods (Frobenius endomorphism) and reduction to characteristic $p$; tight    13A35  
closure of rings and ideals; integrally closed rings, related rings (Japanese, etc.) # integral    13B22  
closure spaces, etc.) # topological spaces and generalizations (   54A05  
closure systems # geometric    51Dxx  
cloud chambers # in Wilson    539.777  
cluster analysis # classification and discrimination;    62H30  
cluster sets, prime ends, boundary behavior   30D40  
clustering   91C20  
co)homologies (e.g., intersection, equivariant, Lawson, Deligne (co)homologies) # other algebro-geometric (   14F43  
co)homology of commutative rings and algebras (e.g., Hochschild, Andr\'e - Quillen, cyclic, dihedral, etc.) # (   13D03  
Co)homology of rings and algebras (e.g. Hochschild, cyclic, dihedral, etc.) # (   16E40  
co)homology theories # other (   18G60  
co)homology theory # (   14Fxx  
coalgebras, bialgebras, Hopf algebras   16W30  
coarse moduli spaces # fine and    14D22  
cobar constructions # bar and    57T30  
cobordism   57Q20  
cobordism # equivariant    57R85  
cobordism # h$- and $s$-   57R80  
cobordism # other types of    57R90  
cobordism (U- and SU-cobordism) # complex    57R77  
cobordism and concordance   57N70  
cobordism and concordance   57Q60  
cobordism theories, formal group laws # bordism and    55N22  
cocategory, etc. # category and    55P50  
codes # arithmetic    94B40  
codes # bounds on    94B65  
codes # burst-correcting    94B20  
codes # combinatorial    94B25  
codes # convolutional    94B10  
codes # cyclic    94B15  
codes # majority    94B30  
codes # other types of    94B60  
codes # synchronization error-correcting    94B50  
codes # theory of error-correcting codes and error-detecting    94Bxx  
codes and caps in Galois spaces # linear    51E22  
codes and error-detecting codes # theory of error-correcting    94Bxx  
codes) # combined modulation schemes (including trellis    94B12  
codes, general # linear    94B05  
codimension problems # low    14M07  
coding # source    94A29  
coding and information theory (compaction, compression, models of communication, encoding schemes, etc.)   68P30  
coding theorems (Shannon theory)   94A24  
coding theory # relations with    11H71  
coding theory and cryptography # applications to    14G50  
coding theory; cryptography # algebraic    11T71  
coefficient problems for univalent and multivalent functions   30C50  
coefficient theorems, Bockstein operator # universal    55U20  
coefficients # equations and systems with constant    35Exx  
coefficients # Fourier series and    42B05  
coefficients # overdetermined systems with constant    35N05  
coefficients (general) # overdetermined systems with variable    35N10  
coefficients of automorphic forms # Fourier    11F30  
coefficients or data # PDE with discontinuous    35R05  
coefficients, equivariant cohomology # homology with local    55N25  
coefficients, etc.) for PDE # inverse problems (undetermined    35R30  
coefficients, Fourier series of functions with special properties, special Fourier series # Fourier    42A16  
coefficients, monotonic coefficients, etc.) # trigonometric series of special types (positive    42A32  
coefficients; factorials; $q$-identities # binomial    11B65  
cofinalities; pcf theory # ordered sets and their    03E04  
cognitive psychology   91E10  
Cohen - Macaulay modules   13C14  
Cohen - Macaulay modules   16G50  
Cohen - Macaulay, Gorenstein, Buchsbaum, etc.) # special types (   13H10  
coherent states   81R30  
cohomological dimension   12G10  
cohomological methods # quantization in field theory;    81T70  
cohomological properties # global theory of singularities;    32S20  
cohomologies # etale and other Grothendieck topologies and    14F20  
cohomology # algebraic cycles and motivic    19E15  
cohomology # classical real and complex    14F25  
cohomology # classifying spaces for foliations; Gelfand - Fuks    57R32  
cohomology # continuous    22E41  
cohomology # de_Rham    14F40  
cohomology # elliptic    55N34