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W. Buchholz (1981)
Iterated Inductive Definitions and Subsystems of Analysis: Recent Proof-theoretical Studies
M. Rathjen (1994)
Proof Theory of ReflectionAnn. Pure Appl. Log., 68
N. Goodman (1978)
Relativized realizability in intuitionistic arithmetic of all finite typesJournal of Symbolic Logic, 43
K. Schütte (1977)
Proof theory
W. Buchholz (1993)
A simplified version of local predicativity
A. Troelstra (1973)
Metamathematical investigation of intuitionistic arithmetic and analysis
In this article we prove that a certain intuitionistic version of the well-known fixed point theory $\widehat{\rm ID}_1$ is conservative over $\mbox{\sf HA}$ for almost negative formulas.
Archive for Mathematical Logic – Springer Journals
Published: Dec 1, 1997
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