Volume 7, 1995

University of Bialystok

Copyright (c) 1995 Association of Mizar Users

**Yatsuka Nakamura**- Shinshu University, Nagano
**Piotr Rudnicki**- University of Alberta, Edmonton
**Andrzej Trybulec**- Warsaw University, Bialystok
**Pauline N. Kawamoto**- Shinshu University, Nagano

- This article is the last in a series of four articles (preceded by [22], [23], [21]) about modelling circuits by many sorted algebras.\par The notion of a circuit computation is defined as a sequence of circuit states. For a state of a circuit the next state is given by executing operations at circuit vertices in the current state, according to denotations of the operations. The values at input vertices at each state of a computation are provided by an external sequence of input values. The process of how input values propagate through a circuit is described in terms of a homomorphism of the free envelope algebra of the circuit into itself. We prove that every computation of a circuit over a finite monotonic signature and with constant input values stabilizes after executing the number of steps equal to the depth of the circuit.

Partial funding for this work has been provided by: Shinshu Endowment Fund for Information Science, NSERC Grant OGP9207, JSTF award 651-93-S009.

- Circuit Inputs
- Circuit Computations

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