Frege on Identity

Dejnožka, Jan

doi:10.5840/intstudphil198113135

International Studies in Philosophy

1981

DOI: 10.5840/intstudphil198113135

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Frege on Identity

Jan Dejnožka¹

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Cited by 7 publications

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“…Other than Dummett 1973 and writings by either him or Nathan Salmon, Soames only refers in the two chapters on Frege to the following works on Frege…Beaney 1996, Burgess 2005, Currie 1982, Dejnozka 1981, 1996, Kripke 2008, Perry 1977, Thau and Caplan 2000, Yourgrau 1982, 1986o imply that there is little else worth reading is inexcusable.…”

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Reply to critics of the analytic tradition in philosophy vol. 1 the founding giants

Soames¹

2015

Philos Stud

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confidence: 96%

Reply to critics of the analytic tradition in philosophy vol. 1 the founding giants

Soames¹

2015

Philos Stud

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“…In fact, the reference to any of the literature that has since been written on Frege is astonishingly thin. Other than Dummett (1973) and writings by either him or Nathan Salmon, Soames only refers in the two chapters on Frege to the following works on Frege (in alphabetical order): Beaney (1996), Burgess (2005), Currie (1982), Dejnozka (1981Dejnozka ( , 1996, Kripke (2008), Perry (1977Perry ( , 1979, Thau and Caplan (2000), Yourgrau (1982Yourgrau ( , 1986Yourgrau ( -1987. 6 Of these, Currie's introduction to Frege's philosophy receives by far the most citations (twelve in all), suggesting that for Soames, the literature on Frege pretty much stopped in 1982.…”

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Soames on Frege: provoking thoughts

Beaney

2015

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The Concept of Relevance and the Logic Diagram Tradition

Dejnožka

2010

Log. Univers.

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What is logical relevance? Anderson and Belnap say that the "modern classical tradition [,] stemming from Frege and WhiteheadRussell, gave no consideration whatsoever to the classical notion of relevance." But just what is this classical notion? I argue that the relevance tradition is implicitly most deeply concerned with the containment of truth-grounds, less deeply with the containment of classes, and least of all with variable sharing in the Anderson-Belnap manner. Thus modern classical logicians such as Peirce, Frege, Russell, Wittgenstein, and Quine are implicit relevantists on the deepest level. In showing this, I reunite two fields of logic which, strangely from the traditional point of view, have become basically separated from each other: relevance logic and diagram logic. I argue that there are two main concepts of relevance, intensional and extensional. The first is that of the relevantists, who overlook the presence of the second in modern classical logic. The second is the concept of truth-ground containment as following from in Wittgenstein's Tractatus. I show that this second concept belongs to the diagram tradition of showing that the premisses contain the conclusion by the fact that the conclusion is diagrammed in the very act of diagramming the premisses. I argue that the extensional concept is primary, with at least five usable modern classical filters or constraints and indefinitely many secondary intensional filters or constraints. For the extensional concept is the genus of deductive relevance, and the filters define species. Also following the Tractatus, deductive relevance, or full truth-ground containment, is the limit of inductive relevance, or partial truth-ground containment. Purely extensional inductive or partial relevance has its filters or species too. Thus extensional relevance is more properly a universal concept of relevance or summum genus with modern classical deductive logic, relevantist deductive logic, and inductive logic as its three main domains.

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Frege on Identity

Cited by 7 publications

References 0 publications

Reply to critics of the analytic tradition in philosophy vol. 1 the founding giants

Reply to critics of the analytic tradition in philosophy vol. 1 the founding giants

Soames on Frege: provoking thoughts

The Concept of Relevance and the Logic Diagram Tradition

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