Download A Logical Approach to Philosophy: Essays in Honour of Graham by David DeVidi, Tim Kenyon PDF

By David DeVidi, Tim Kenyon

The papers during this assortment are united by way of an method of philosophy. They illustrate the manifold contributions that common sense makes to philosophical growth, either through the appliance of formal the right way to conventional philosophical difficulties and by way of beginning up new avenues of inquiry as philosophers deal with the consequences of recent and infrequently brilliant technical effects. Contributions comprise new technical effects wealthy with philosophical importance for modern metaphysics, makes an attempt to diagnose the philosophical value of a few fresh technical effects, philosophically inspired proposals for brand spanking new ways to negation, investigations within the historical past and philosophy of good judgment, and contributions to epistemology and philosophy of technology that make crucial use of logical ideas and effects. the place the paintings is formal, the explanations are patently philosophical, no longer purely mathematical. the place the paintings is much less formal, it truly is deeply knowledgeable via the appropriate formal fabric. the quantity contains contributions from probably the most attention-grabbing philosophers now operating in philosophical common sense, philosophy of good judgment, epistemology and metaphysics.

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There seems to be plenty of room to debate what is involved in forming the negation of a statement, and for arguing that classical negation doesn’t quite get things right. For instance, if we think back honestly most of us will recall finding explosion an outlandish principle when we first encountered it. So if explosion is part of the classical meaning of negation the relevance logicians at least have a prima facie case to make for their negation as closer to right. On the other hand, classical, intuitionistic and minimal negations all capture nicely the intuition that “not P ” should be the weakest statement incompatible with P —that is, any statement incompatible with P implies “not P ,” so it can profitably be regarded as a sort of disjunction of all possible statements incompatible with P .

In w, Karl believes that Φ, and this belief is justified. That is, in w, Φ ∧ BΦ ∧JΦ holds. By the internalism,Karl can then perform some reasoning and introspection to learn that he believes Φ and that he is justified in this belief. That is, there is a world w accessible from w in which KBΦ and KJΦ both hold. Presumably, we also have that KΦ holds in w . Karl surely cannot lose knowledge by the relevant introspection and reasoning (unless the introspection and reasoning confuse him, but let us ignore that by invoking the usual idealizations).

Suppose that Ce (Φ) is, or entails, that there are no facts that would undermine Karl’s (internal) warrant Ci (Φ) for Φ, were Karl to become aware of them. That is, Karl’s warrant would remain good no matter how much further knowledge he obtains. The present proposal is that Karl knows this by default. If Ci (Φ) is indeed sufficient for knowledge of Φ (provided Ce (Φ) holds), then in the normal cases, there are no undermining facts. And if there are no undermining facts, then Karl knows this, albeit defeasibly.

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