The following sections have been revised in category 00, General:

N - new (red);  M - modified (blue)--- [2001 text for modified codes in green]; D - deleted (purple).
 

02. Mathematical methods in physics

02.10.-v Logic, set theory, and algebra

02.10.Ab Logic and set theory

02.10.De Algebraic structures and number theory

02.10.Hh Rings and algebras

02.10.Kn  Knot theory

N  02.10.Ox   Combinatorics; graph theory

02.10.Ud Linear algebra

02.10.Xm Multilinear algebra

02.10.Yn Matrix theory
_________________

02.70.-c  Computational techniques (for quantum computation, see 03.67.Lx)

02.70.Bf  Finite-difference methods

02.70.Dh Finite-element and Galerkin methods

02.70.Hm Spectral methods

02.70.Jn   Collocation methods

02.70.Ns  Molecular dynamics and particle methods

02.70.Pt   Boundary-integral methods

02.70.Rr   General statistical methods

02.70.Ss   Quantum Monte Carlo methods

02.70.Tt   Justifications or modifications of Monte Carlo methods

02.70.Uu   Applications of Monte Carlo methods (see also 02.50.Ng and 05.10.Ln in statistical physics)

N  02.70.Wz  Symbolic computation (computer algebra)
____________________
 

03.67.-a Quantum information

03.67.Dd Quantum cryptography

03.67.Hk Quantum communication

03.67.Lx Quantum computation

N 03.67.Mn Entanglement production, characterization and manipulation (see also 03.65.Ud Entanglement and quantum nonlocality; for entanglement in Bose-Einstein condensates, see 03.75.Gg)

N 03.67.Pp Quantum error correction and other methods for protection against decoherence (see also 03.65.Yz Decoherence; open systems; quantum statistical methods; for decoherence in Bose-Einstein condensates, see 03.75.Gg)
______________

03.75-b Matter waves (for atom interferometry techniques, see 39.20--in atomic and molecular physics)

03.75.Be   Atom and neutron optics

03.75.Dg   Atom and neutron interferometry

D 03.75.Fi  Phase coherent atomic ensembles;  quantum condensation phenomena

N 03.75.Gg Entanglement and decoherence in Bose-Einstein condensates

N 03.75.Hh Static properties of condensates; thermodynamical, statistical and structural properties

N 03.75.Kk Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow

N 03.75.Lm Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices and topological excitations

N 03.75.Mm Multicomponent condensates; spinor condensates

N  03.75.Nt  Other Bose-Einstein condensation phenomena

N 03.75.Pp Atom lasers

N 03.75.Ss Degenerate Fermi gases
______________

04.60.-m   Quantum gravity

04.60.Ds   Canonical quantization

04.60.Gw   Covariant and sum-over-histories quantization

04.60.Kz   Lower dimensional models; minisuperspace models

04.60.Nc   Lattice and discrete methods

N  04.60.Pp  Loop quantum gravity, quantum geometry, spin foams
________________________

05.45.-a   Nonlinear dynamics and nonlinear dynamical systems (see also 45 Classical mechanics of discrete systems)

05.45.Ac   Low-dimensional chaos

05.45.Df   Fractals (see also 47.53 Fractals in fluid dynamics)

05.45.Gg   Control of chaos, applications of chaos

05.45.Jn   High-dimensional chaos

M  05.45.Mt   Quantum chaos; semiclassical methods --- [Original text:  Semiclassical chaos (“quantum chaos”)]

M  05.45.Pq   Numerical simulations of chaotic systems --- [Original text:  Numerical simulations of chaotic models]

05.45.Ra   Coupled map lattices

05.45.Tp   Time series analysis

05.45.Vx   Communication using chaos

05.45.Xt   Synchronization; coupled oscillators

M  05.45.Yv   Solitons [Original text:  same]  (see 52.35.Sb for solitons in plasma; for solitons in acoustics, see 43.25.Rq—in acoustics appendix;  see 42.50.Md, 42.65.Tg, 42.81.Dp for solitons in optics; see also 03.75.Lm Tunneling, Josephson effect, Bose-Einstein condensates in peroiodic potentials, solitons, vortices, and topological excitations)
_______________

07.20.-n   Thermal instruments and apparatus

07.20.Dt   Thermometers

07.20.Fw   Calorimeters (for calorimeters as radiation detectors, see 29.40.Vj)

07.20.Hy   Furnaces; heaters

07.20.Ka   High-temperature instrumentation; pyrometers

07.20.Mc   Cryogenics; refrigerators, low-temperature equipment

M  07.20.Pe   Heat engines; heat pumps; heat pipes