منابع مشابه
Dualising Initial Algebras
Whilst the relationship between initial algebras and monads is well understood, the relationship between final coalgebras and comonads is less well explored. This paper shows that the problem is more subtle than might appear at first glance: final coalgebras can form monads just as easily as comonads, and, dually, initial algebras form both monads and comonads. In developing these theories we s...
متن کاملOn the Relative Dualising Sheaf of a Symplectic Lefschetz Fibration
For the dualising sheaf ωX/B of a relatively minimal symplectic Lefschetz fibration π : X → B, we show that c21(ωX/B) ≥ 0. Some consequences related to the Hodge bundle are obtained.
متن کاملNegation Without Negation in Probabilistic Logic Programming
Probabilistic logic programs without negation can have cycles (with a preference for false), but cannot represent all conditional distributions. Probabilistic logic programs with negation can represent arbitrary conditional probabilities, but with cycles they create logical inconsistencies. We show how allowing negative noise probabilities allows us to represent arbitrary conditional probabilit...
متن کاملNegation and Double-Negation of Chinese Oppositeness
Oppositeness refers to the paradigmatic relationship of two words holding the contrast meanings. The fact that linguistic opposite differs from logical contrast has been discussed in theories, but has not been tested in practice. In this paper, we investigate three main subtypes of Chinese oppositeness, via using logical tests of negation and double-negation. Result shows that purely logical te...
متن کاملCombining Explicit Negation and Negation by Failure via Belnap's Logic Combining Explicit Negation and Negation by Failure via Belnap's Logic
This paper deals with logic programs containing two kinds of negation: negation as failure and explicit negation, allowing two diierent forms of uncertainty reasoning in the presence of incomplete information. Such programs have been introduced by Gelfond and Lifschitz and called extended programs. We provide them with a logical semantics in the style of Kunen, based on Belnap's four-valued log...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Principia: an international journal of epistemology
سال: 2009
ISSN: 1808-1711,1414-4247
DOI: 10.5007/1808-1711.2009v13n2p165