Results 21 to 30 of about 110,934 (299)

ELIMINATING DISJUNCTIONS BY DISJUNCTION ELIMINATION

open access: yesThe Bulletin of Symbolic Logic, 2017
AbstractCompleteness and other forms of Zorn’s Lemma are sometimes invoked for semantic proofs of conservation in relatively elementary mathematical contexts in which the corresponding syntactical conservation would suffice. We now show how a fairly general syntactical conservation theorem that covers plenty of the semantic approaches follows from an ...
RINALDI, DAVIDE   +2 more
openaire   +4 more sources

Rasiowa–Harrop disjunction property [PDF]

open access: yes, 2016
We show that there is a purely proof-theoretic proof of the Rasiowa–Harrop disjunction property for the full intuitionistic propositional calculus (IPC), via natural deduction, in which commuting conversions are not needed. Such proof is based on a sound
Ferreira, Gilda
core   +1 more source

Disjunctive normal networks [PDF]

open access: yesNeurocomputing, 2016
Artificial neural networks are powerful pattern classifiers; however, they have been surpassed in accuracy by methods such as support vector machines and random forests that are also easier to use and faster to train. Backpropagation, which is used to train artificial neural networks, suffers from the herd effect problem which leads to long training ...
Mehdi Sajjadi   +2 more
openaire   +2 more sources

Mental Models for the Negation of Conjunctions and Disjunctions

open access: yesEurope's Journal of Psychology, 2014
This study investigates why reasoning that involves negation is extremely difficult. We presented participants with reasoning problems containing sentences with negation of conjunctions and disjunctions in order to test predictions derived from the ...
Guillermo Macbeth   +5 more
doaj   +1 more source

An Evolutionary Study of Carex Subg. Psyllophorae (Cyperaceae) Sheds Light on a Strikingly Disjunct Distribution in the Southern Hemisphere, With Emphasis on Its Patagonian Diversification

open access: yesFrontiers in Plant Science, 2021
Carex subgenus Psyllophorae is an engaging study group due to its early diversification compared to most Carex lineages, and its remarkable disjunct distribution in four continents corresponding to three independent sections: sect.
Carmen Benítez-Benítez   +9 more
doaj   +1 more source

Disjunctive datalog

open access: yesACM Transactions on Database Systems, 1997
We consider disjunctive Datalog, a powerful database query language based on disjunctive logic programming. Briefly, disjunctive Datalog is a variant of Datalog where disjunctions may appear in the rule heads; advanced versions also allow for negation in the bodies which can be handled according to a semantics for negation in disjunctive ...
Eiter, T, Gottlob, G, Mannila, H
openaire   +1 more source

Angiosperm disjunction "Campos rupestres - restingas": a re-evaluation Disjunção de Angiospermas Campos Rupestres - Restingas: uma reavaliação

open access: yesActa Botânica Brasílica, 2007
A disjunct distribution pattern between the extrazonal formations of the campos rupestres (rocky grasslands) in the Espinhaço mountain range and the restingas (coastal strand vegetation) in Brazil has been proposed repeatedly for several flowering-plant ...
Ruy José Válka Alves   +2 more
doaj   +1 more source

Three new species of Eupetersia Blüthgen 1928 (Hymenoptera, Halictidae) from the Oriental Region.

open access: yesEuropean Journal of Taxonomy, 2012
Three new species, Eupetersia (Nesoeupetersia) singaporensis sp. nov., collected in a mangrove swamp in Singapore, and Eupetersia (Nesoeupetersia) sabahensis sp.
Alain Pauly
doaj   +1 more source

TOR: modular search with hookable disjunction [PDF]

open access: yes, 2014
Horn Clause Programs have a natural exhaustive depth-first procedural semantics. However, for many programs this semantics is ineffective. In order to compute useful solutions, one needs the ability to modify the search method that explores the ...
Demoen, Bart   +3 more
core   +1 more source

Scalar and Ignorance Inferences Are Both Computed Immediately upon Encountering the Sentential Connective: The Online Processing of Sentences with Disjunction Using the Visual World Paradigm

open access: yesFrontiers in Psychology, 2018
Accounts based on the pragmatic maxim of quantity make different predictions about the computation of scalar versus ignorance inferences. These different predictions are evaluated in two eye-tracking experiments using a visual world paradigm to assess ...
Likan Zhan
doaj   +1 more source

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