One can always include a “clock” in order to pass from a given system to a time-invariant system that behaves as the original one.
Mathematically, however, this associated time-invariant system is a different object; for instance, the set T has changed.
Moreover, many desirable properties may be lost in the reformulation; for example, the first system that we gave is linear over the field GF(2) (that is, R under mod-2 operations) in the sense to be defined below, but the corresponding time-invariant system is not.
One can always include a “clock” in order to pass from a given system to a time-invariant system that behaves as the original one.Mathematically, however, this associated time-invariant system is a different object; for instance, the set T has changed.Moreover, many desirable properties may be lost in the reformulation; for example, the first system that we gave is linear over the field GF(2) (that is, R under mod-2 operations) in the sense to be defined below, but the corresponding time-invariant system is not.
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