ILC 1 expanded class au

      au    functions 

au	functions, equations  [calculus, analysis]
au6  [a]	at x =, domain input
au9  [a]	having values, range output
aua	constants
aub	real functions  [real analysis]
auc	integrals  [measure, integration]
aud	functions of a complex variable
aue	potential  [potential theory]
auf	several complex variables, analytic spaces
aug	special functions
auh	ordinary differential equation
aui	partial differential equations
auj	dynamical systems  [ergodic theory]
auk	difference equations, functional equations
aul	sequences, series, summability
aum	approximations, expansions
aun	sinusoidal basis functions  [Fourier analysis]
aun3  [:]	through Fourier transform
auo	basic waves  [abstract harmonic analysis]
aup	integral transforms  [operational calculus]
auq	integral equations
aur	spaces of functions  [functional analysis]
aus	operators  [operator theory]
auv	calculus of variations, optimal control
av8  [au]	by equation
bb8  [au]	with equation  [differential geometry, differential topology]

or

Facets key
0  under aspect      
1  at time           
2  in place          
3  through process   
4  made of element   
5  with organ        
6  from origin       
7  to destination    
8  like pattern      
9  of kind