theories # Yang - Mills and other gauge    70S15  
theories # Yang - Mills and other gauge    81T13  
theories (e.g. algebraic theories), structure, and semantics   18C10  
theories (including reverse mathematics) # foundations of classical    03B30  
theories and mathematical physics   530.1  
theories and sets of sentences # decidability of    03B25  
theories for operators and differential equations # perturbation    81Q15  
theories of fracture and damage   74A45  
theories of friction (tribology)   74A55  
theories other than Einstein's, including asymmetric field theories # relativistic gravitational    83D05  
theories), structure, and semantics # theories (e.g. algebraic    18C10  
theories, conformal field theories, etc. # two-dimensional field    81T40  
theories, epistemology, philosophies of teaching and learning, etc.) # theoretical perspectives (learning    97C50  
theories, formal group laws # bordism and cobordism    55N22  
theories, including dynamic programming # Hamilton - Jacobi    49Lxx  
theories, radicals # torsion    18E40  
theories; other extended objects (e.g., branes) # string and superstring    81T30  
theory # (co)homology    14Fxx  
theory # abstract and axiomatic computability and recursion    03D75  
theory # abstract and axiomatic homotopy    55U35  
theory # abstract bifurcation    47J15  
theory # abstract bifurcation    58E07  
theory # abstract measure    515.783  
theory # abstract model    03C95  
theory # actions of groups and semigroups; invariant    16W22  
theory # actions of groups on commutative rings; invariant    13A50  
theory # algebra & number    512  
theory # algebraic    14K05  
theory # algebraic $K$-theory and $L$-   18F25  
theory # algebraic number    512.74  
theory # analytic circuit    94C05  
theory # analytic number    512.73  
theory # applications of computability and recursion    03D80  
theory # applications of design    94C30  
theory # applications of game    91A80  
theory # applications of graph    94C15  
theory # applications of logic to group    20A15  
theory # applications of methods of algebraic $K$-   14C35  
theory # applications of model    03C98  
theory # applications of set    03E75  
theory # applications to control    58E25  
theory # applied homological algebra and category    55Uxx  
theory # asymptotic    34Exx  
theory # asymptotic    34K25  
theory # asymptotic distribution    62E20  
theory # axiomatic potential    31D05  
theory # axiomatic system    93A05  
theory # bifurcation    34K18  
theory # bifurcation    37H20  
theory # boundary    60J50  
theory # boundary-layer    76N20  
theory # Calabi - Yau    32Q25  
theory # catastrophe    58K35  
theory # characterization and structure    62E10  
theory # characterization and structure    62H05  
theory # class field    11R37  
theory # classical Banach spaces in the general    46B25  
theory # classical measure    28Axx  
theory # cohomology    20G10  
theory # communication    94A05  
theory # computability and recursion    03Dxx  
theory # computational learning    68Q32  
theory # computational number    11Yxx  
theory # connections of semigroups with homological algebra and category    20M50  
theory # connections with homological algebra and category    20Jxx  
theory # constructive operator    47S30  
theory # constructive quantum field    81T08  
theory # control    629.8312  
theory # convex sets in topological linear spaces; Choquet    46A55  
theory # corpuscular    535.12  
theory # covering theorems in conformal mapping    30C25  
theory # database    68P15  
theory # de_Rham    58A12  
theory # decision    003.56  
theory # decision    519.542  
theory # decision    62Cxx  
theory # decision    91B05  
theory # degree    47H11  
theory # descriptive set    03E15  
theory # detection    94A13  
theory # dimension    54F45  
theory # dimension    55M10  
theory # distribution    515.782  
theory # distribution    60Exx  
theory # distribution    62Exx  
theory # distributions: general    60E05  
theory # duality    46A20  
theory # duality    49N15  
theory # dynamical systems and ergodic    37-XX  
theory # effective and recursion-theoretic model    03C57  
theory # electromagnetic    530.141  
theory # electromagnetic    535.14  
theory # elementary number    512.72  
theory # elementary number    11Axx  
theory # equilibrium: general    91B14  
theory # equivariant $K$-   19L47  
theory # equivariant homotopy    55P91  
theory # ergodic    37Axx  
theory # ergodic    47A35  
theory # estimation    519.544  
theory # exact distribution    62E15  
theory # extension    13B02  
theory # extremal set    05D05  
theory # fine potential    31C40  
theory # finely holomorphic functions and topological function    30G12  
theory # foliations; geometric    57R30  
theory # foundations of probability    60Axx  
theory # functional analytic lifting    46G15  
theory # functionals in proof    03F10  
theory # fuzzy measure    28E10  
theory # fuzzy operator    47S40  
theory # fuzzy set    03E72  
theory # G\"odel numberings in proof    03F40  
theory # Galois    11R32  
theory # Galois    11S20  
theory # game    519.3  
theory # game    91Axx  
theory # games involving topology or set    91A44  
theory # general    17A01  
theory # general    34Axx  
theory # general    34K05  
theory # general    35Axx  
theory # general    35E20  
theory # general    51B05  
theory # general    51H05  
theory # general    51J05  
theory # general    51K05  
theory # general    65J05  
theory # general commutative ring    13Axx  
theory # general field    12Exx  
theory # general mathematical topics and methods in quantum    81Qxx  
theory # general module    16D10  
theory # general spectral    34L05  
theory # general structure    20M10  
theory # general valuation    12J20  
theory # generalized class field    19F05  
theory # generalized function    30Gxx  
theory # generalized Ramsey    05C55  
theory # geometric class field    11G45  
theory # geometric function    30Cxx  
theory # geometric group    20F65  
theory # geometric invariant    14L25  
theory # global    58K30  
theory # graph    05Cxx  
theory # graph    68R10  
theory # group-invariant bifurcation    58E09  
theory # groups and algebras in quantum    81Rxx  
theory # groups and group    512.2  
theory # Helly-type theorems and geometric transversal    52A35  
theory # higher algebraic $K$-   19Dxx  
theory # higher-dimensional    31Bxx  
theory # higher-order logic and type    03B15  
theory # higher-type and set recursion    03D65  
theory # Hodge    58A14  
theory # homological methods in group    20J05  
theory # homotopy    514.24  
theory # homotopy    55Pxx  
theory # ideal    20M12  
theory # ideal boundary    30F25  
theory # ideals; multiplicative ideal    13A15  
theory # index    19K56  
theory # information    003.54  
theory # interacting random processes; statistical mechanics type models; percolation    60K35  
theory # invariant manifold    37D10  
theory # inverse Galois    12F12  
theory # inverse problems of additive number    11P70  
theory # Iwasawa    11R23  
theory # K$-   19-XX  
theory # K$-   55N15  
theory # K$-theory in number    19Fxx  
theory # Karoubi - Villamayor - Gersten $K$-   19D25  
theory # lifting    28A51  
theory # linear and multilinear algebra; matrix    15-XX  
theory # linear vibration    70Jxx  
theory # local    14Bxx  
theory # local and global bifurcation    37Gxx  
theory # lubrication    76D08  
theory # Martin boundary    31C35  
theory # mathematically heuristic optics and electromagnetic    78A97  
theory # measure-theoretic ergodic    28Dxx  
theory # measurement    91C05  
theory # mechnical wave    535.13  
theory # methods of quantum field    83C47  
theory # metric    11J83  
theory # Milnor fibration; relations with knot    32S55  
theory # miscellaneous applications of $K$-   19M05  
theory # miscellaneous applications of number    11Z05  
theory # miscellaneous applications of operator    47Nxx  
theory # miscellaneous topics in measure    28Exx  
theory # model    03Cxx  
theory # model    11U09  
theory # model    12L12  
theory # models of arithmetic and set    03C62  
theory # multiplicative number    11Nxx  
theory # n$-body potential scattering    81U10  
theory # non-Archimedean function    30G06  
theory # nonstandard measure    28E05  
theory # nonstandard operator    47S20  
theory # number    512.7  
theory # number    11-XX  
theory # numerical methods in conformal mapping    30C30  
theory # obstruction    55S35  
theory # operator    515.724  
theory # operator    47-XX  
theory # operator approximation    47A58  
theory # ordered sets and their cofinalities; pcf    03E04  
theory # oscillation    34K11  
theory # other (nonclassical) types of operator    47Sxx  
theory # other ``noncommutative'' mathematics based on $C^*$-algebra    46L89  
theory # other analytic    11R47  
theory # other classical first-order model    03C68  
theory # other combinatorial number    11B75  
theory # other combinatorial set    03E05  
theory # other connections with logic and set    28E15  
theory # other elementary particle    81V25  
theory # other nonanalytic    11S85  
theory # p$-adic    11E95  
theory # perception    003.52  
theory # perturbation    47A55  
theory # philosophy and    005.101  
theory # philosophy and    330.01  
theory # philosophy and    401  
theory # philosophy and    510.1  
theory # philosophy and    530.01  
theory # philosophy and    530.801  
theory # philosophy and    532.001  
theory # philosophy and    536.01  
theory # philosophy and    536.701  
theory # philosophy and    537.01  
theory # philosophy and    539.01  
theory # pluripotential    32Uxx  
theory # pluripotential    32U15  
theory # polylogarithms and relations with $K$-   11G55  
theory # potential    31-XX  
theory # prediction    60G25  
theory # probabilistic measure    60A10  
theory # probabilistic methods in Banach space    46B09  
theory # probabilistic methods in group    20P05  
theory # probabilistic number    512.76  
theory # probabilistic potential    60J45  
theory # proper homotopy    55P57  
theory # qualitative    34Cxx  
theory # quantum    535.15  
theory # quantum    81-XX  
theory # quantum field    530.143  
theory # quantum measurement    81P15  
theory # queueing    60K25  
theory # radical    13A10  
theory # radical    17A65  
theory # radical    20M11  
theory # ramification and extension    11S15  
theory # Ramsey    05D10  
theory # rate-distortion    94A34  
theory # rational homotopy    55P62  
theory # recursion    511.35  
theory # relations between equivariant and nonequivariant homotopy    55P92  
theory # relations with coding    11H71  
theory # relations with graph    57M15  
theory # relativity    530.11  
theory # relativity and gravitational    83-XX  
theory # renewal    60K05  
theory # representation    515.7223  
theory # representation    06B15  
theory # representation    20G05  
theory # representation    47A67  
theory # sampling    94A20  
theory # scattering    34L25  
theory # scattering    47A40  
theory # scattering    81Uxx  
theory # search    90B40  
theory # second- and higher-order model    03C85  
theory # set    511.322  
theory # set    03Exx  
theory # set-theoretic model    03C55  
theory # shape    54C56  
theory # shape    55P55  
theory # singular    55N10  
theory # smooth dynamical systems: general    37Cxx  
theory # spectral    515.7222  
theory # spectral problems; spectral geometry; scattering    58J50  
theory # spectral regions; philosophy and    535.01  
theory # stability    34Dxx  
theory # stability    34K20  
theory # stability    37C75  
theory # stability    45M10  
theory # stopping times; optimal stopping problems; gambling    60G40  
theory # structure    06B05  
theory # structure    06E05  
theory # structure    08A05  
theory # structure    11T30  
theory # structure    17A60  
theory # structure    17B05  
theory # structure    17C10  
theory # structure    47A65  
theory # structure and representation    06D05  
theory # Sturm - Liouville    34B24  
theory # superstring    539.7258  
theory # Teichm\"uller    30F60  
theory # theory of forms and algebraic invariant    512.944