81XX 


Quantum theory 

81Sxx 

General quantum mechanics and problems of quantization 


81S05 
Commutation relations and statistics 


81S10 
Geometry and quantization, symplectic methods [See also 53D50] 


81S20 
Stochastic quantization 


81S25 
Quantum stochastic calculus 


81S30 
Phase space methods including Wigner distributions, etc. 


81S40 
Path integrals [See also 58D30] 


81S99 
None of the above, but in this section 