Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

What is modal logic

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Flow The Psychology Of Optimal Experience

Every organisation from the scale of whole countries down to small companies has a list of system developments which have ended in various forms of disaster. The nature of the failures varies but typical examples are: cost overruns; timescale overruns and sometimes, loss of life. The post-mortems to these systems reveal a wide range of reasons all the way from hardware failures, through software errors right to major system level mistakes. More importantly a large number of these systems share one attribute: complexity. This paper presents a fresh look at the nature of complexity in the building of computer based systems.

http://ieeexplore.ieee.org/iel3/4458/12639/00581896.pdf

Complex systems

Agreeing to disagree.

. Weprovideproof-theoreticresultsaboutdeliberativeSTIT logic. FirstwepresentSTITlogicforindividualagentswithouttime,wheretheproblemofsatisﬁabilityhasrecentlybeenshowntobeNEXPTIME-completeinthegeneralcase. ThenwestudySTIT logicforgroupsofagents. Weprovethatsatisﬁabilityof STIT formulasinvolvinggroupsofagentsisundecidablebyreducingtheproblemofsatisﬁabilityofaformulaoftheproductlogicS5 n togroupSTIT satisﬁabilityproblem.WealsoprovethatgroupSTIT isnotﬁnitelyaxiomatizable. Keywords: logics of agency, deliberative STIT, joint action, decidability, axiomatizability,complexity 1 Introduction While logics of programs and actions such as PDL allow to reason about the relation betweenanactionanditseﬀects,so-calledlogicsofagencyareabouttherelationbetweenanagentandthe eﬀects of his actions. The latter are relevant in game theory, theoretical computer scienceandphilosophyofaction.Ingametheory,Pauly’scoalitionlogic(CL)allowstoreasonaboutthecapabilitiesofcoalitions[14]. Itprovidesforexpressionsofthekind“coalitionJcanmake’trueatthenexttimepoint”.Intheoreticalcomputerscience,Alternating-timeTemporalLogicsATL andATL wereintro-ducedbyHenzingeretal.inordertoreasonaboutdistributedprocesses[2]. TheformulahhJii’reads“coalitionJhasastrategysuchthat’holds”,where’isaformulaoflineartemporallogic(that has to satisfy some restrictions in the case of ATL). Goranko showed that CL is nothingbutafragmentof ATL (whichinturnisafragmentof ATL ),byidentifyingtheCL formula[J]’withtheATL formulahhJiiX’[9],whereXisthetemporal‘next’operator.Inphilosophyofactionconstructionsoftheform[istit: ’] wereintroducedbyBelnapetcol.[4],read“agentiseestoitthat’” or“ibringsitaboutthat’”. Inthispaper,wefocusonthebasic version that is called Chellas STIT [6] (thus baptized by [10]), noted [icstit: ’] in theliterature. (TheoriginaloperatordeﬁnedbyChellasisneverthelessnotablydiﬀerentsinceitdoesnotcomewiththeprincipleofindependenceofagentsthatplaysacentralroleinSTIT theory.)TheChellasSTIT wasextendedtogroupagencyin[4,Section10.C]and[11,Section2.4]. ForasetofagentsJ,theformula[Jcstit: ’] reads“groupJseestoitthat’”. Weherewrite[J]’instead of [Jstit: ’]. These logics moreover have a modal operator of historical necessity .RecentlyBroersenetal.showedthatATL canbeembeddedintothelogicoftheChellas STIT,byidentifyinghhJiiX’with: :[J]X’[5]. Thishighlightsthatthemodaloperatorsof CL andATL arenothingbutfusionsofthreemodaloperators. STIT-logicsarethereforethemostgeneralformal framework for agency, allowing not only to reason about what agents can do, but alsoaboutwhattheydo.While it is known that the satisﬁability problem is PSPACE-complete for coalition logic CL[14],andEXPTIME-completeforATL [19],and2EXPTIME-completeforATL [15],onlylittleis known about the mathematical properties of STIT logic. Up to now the only known results

/pdf/properties-of-logics-of-individual-and-group-agency-4qjmecmv55.pdf

Properties of logics of individual and group agency

A logic for reasoning about counterfactual emotions

Epistemic planning is a very expressive framework that extends automated planning by the incorporation of dynamic epistemic logic (DEL). We provide complexity results on the plan existence problem for multi-agent planning tasks, focusing on purely epistemic actions with propositional preconditions. We show that moving from epistemic preconditions to propositional preconditions makes it decidable, more precisely in EXPSPACE. The plan existence problem is PSPACE-complete when the underlying graphs are trees and NP-complete when they are chains (including singletons). We also show PSPACE-hardness of the plan verification problem, which strengthens previous results on the complexity of DEL model checking.

/pdf/complexity-results-in-epistemic-planning-5du0hd23n5.pdf

Complexity results in epistemic planning

Although Dynamic Epistemic Logic (DEL) is an influential logical framework for representing and reasoning about information change, little is known about the computational complexity of its associated decision problems In fact, we only know that for public announcement logic, a fragment of DEL, the satisfiability problem and the model-checking problem are respectively PSPACE-complete and in P We contribute to fill this gap by proving that for the DEL language with event models, the model-checking problem is, surprisingly, PSPACE-complete Also, we prove that the satisfiability problem is NEXPTIME-complete In doing so, we provide a sound and complete tableau method deciding the satisfiability problem

/pdf/on-the-complexity-of-dynamic-epistemic-logic-f1s2f2prgs.pdf

On the Complexity of Dynamic Epistemic Logic

https://ir.cwi.nl/pub/25365/ditmarsch-van-eijck.pdf

François Schwarzentruber

Papers

Properties of logics of individual and group agency

A logic for reasoning about counterfactual emotions

Complexity results in epistemic planning

On the Complexity of Dynamic Epistemic Logic

Epistemic protocols for dynamic gossip