Abstract
The conventional definition of multidimensional (m-D) bounded-input bounded-output (BIBO) stability permits the m-D domain of the input signal, and of the m-D computations, to be of infinite extent in all m-dimensions. The definition of m-D practical-BIBO (P-BIBO) stability restricts the m-D domain of the input signal, and of the computations, to be of finite extent in all but one of the m dimensions. It is shown that the P-BIBO stability criterion corresponds to those computations that can be made with a machine having a finite number of (infinite-precision) memory storage elements, whereas the BIBO stability criterion, which is more restrictive, also includes machines having an infinite number of (infinite-precision) memory storage elements. It is argued that the extension of the BIBO stability criterion to include such infinitely large machines is of limited practical value, and that P-BIBO stability is the more useful criterion, and is easier to test. >
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