Journal of Symbolic Logic 49 (3):892 - 899 (1984)

Abstract
In classical propositional calculus for each proposition A(p) the following holds: $\vdash A(p) \leftrightarrow A^3(p)$ . In this paper we consider what remains of this in the intuitionistic case. It turns out that for each proposition A(p) the following holds: there is an n ∈ N such that $\vdash A^n(p) \leftrightarrow A^{n + 2}(p)$ . As a byproduct of the proof we give some theorems which may be useful elsewhere in propositional calculus
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DOI 10.2307/2274142
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Definable Fixed Points in Modal and Temporal Logics—a Survey.Sergey Mardaev - 2007 - Journal of Applied Non-Classical Logics 17 (3):317-346.

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