Completeness and conservative extension results for some Boolean relevant logics

Studia Logica 48 (1):1 - 14 (1989)
This paper presents completeness and conservative extension results for the boolean extensions of the relevant logic T of Ticket Entailment, and for the contractionless relevant logics TW and RW. Some surprising results are shown for adding the sentential constant t to these boolean relevant logics; specifically, the boolean extensions with t are conservative of the boolean extensions without t, but not of the original logics with t. The special treatment required for the semantic normality of T is also shown along the way.
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DOI 10.1007/BF00370629
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