Scherrer, W.

model system process factor behaviour complexity factor models identi error complexity m cation noise factor model variable state result square matrix representation function unit circle system identi cation identi cation input series spectrum consistency analysis assumption time series isometric number condition proposition noise process polynomial proof approximation theorem method modelling system b section transfer 1=2 behavioural circle restriction property space class parameter m inputs equation output order ^ ^ projection orthogonal approach paper scherrer component model sense behaviour b b 2 b example n 0 n component n states scheme k su ciently uniform converge ciently lemma factor scheme uniform norm model class transfer function