Practicable fud decomposition fud

Code commentary on the implementation of Tractable and Practicable Inducers/Python Implementation/Practicable fud decomposition fud

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The Practicable fud decomposition fud function systemsDecompFudsNullablePracticable is defined in module AlignmentPracticable. The implementation expects the model variables in the given fud decomposition to be of type VarPair (VarPair (f, _), _), e.g. <<3,2>,166>, which is the case for the practicable inducers in the Implementation. The resultant fud has an additional layer of derived nullable variables, e.g. <<3,n>,1>, which have an additional value null. If the nullable variables are in children fuds they also depend on a contingent variable, e.g. <<2,c>,1>>, which, in turn, depends on a slice variable, e.g. <<2,s>,1>, and possibly on a parent slice variable, e.g. <<1,s>,2>. Both contingent variables and slice variables have values in and out. Note that the Integer argument g allows more than one nullable layer to be added to a fud decomposition.

systemsDecompFudsNullablePracticable :: System -> DecompFud -> Integer -> Maybe Fud

def systemsDecompFudsNullablePracticable(uu,df,g):
  ...

Note that the system for the resultant fud may be obtained from fudsSystemImplied,

ff = systemsDecompFudsNullablePracticable(uu,df,1)

let uu1 = uunion(uu,fsys(ff))

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