${\rm S}4.6$ is ${\rm S}4.9$.
J. Jay Zeman
Source: Notre Dame J. Formal Logic Volume 13, Number 1
(1972), 118.
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02C10
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Permanent link to this document: http://projecteuclid.org/euclid.ndjfl/1093894632
Zentralblatt MATH identifier: 0214.01101
Mathematical Reviews number (MathSciNet): MR0297543
Digital Object Identifier: doi:10.1305/ndjfl/1093894632
Notre Dame Journal of Formal Logic
