Package net.sf.tweety.logics.fol.syntax

Class Disjunction

java.lang.Object

net.sf.tweety.logics.commons.syntax.RelationalFormula

net.sf.tweety.logics.fol.syntax.FolFormula

net.sf.tweety.logics.fol.syntax.AssociativeFolFormula

net.sf.tweety.logics.fol.syntax.Disjunction

All Implemented Interfaces:

java.lang.Iterable<RelationalFormula>, java.util.Collection<RelationalFormula>, java.util.List<RelationalFormula>, Formula, AssociativeFormulaSupport.AssociativeSupportBridge, AssociativeFormula<RelationalFormula>, ClassicalFormula, ComplexLogicalFormula, Conjunctable, Disjunctable, Invertable, LogicStructure, ProbabilityAware, QuantifiedFormula, SimpleLogicalFormula

public class Disjunction
extends AssociativeFolFormula

The classical disjunction of first-order logic.

Author:

Matthias Thimm

Constructor Summary

Constructors

Constructor	Description
Disjunction()	Creates a new (empty) disjunction.
Disjunction(java.util.Collection<? extends RelationalFormula> formulas)	Creates a new disjunction with the given inner formulas.
Disjunction(RelationalFormula first, RelationalFormula second)	Creates a new disjunction with the two given formulae

Method Summary

Modifier and Type	Method	Description
Disjunction	clone()	Creates a deep copy of this formula
RelationalFormula	collapseAssociativeFormulas()	This method collapses all associative operations appearing in this term, e.g.
Disjunction	createEmptyFormula()
java.lang.String	getEmptySymbol()
java.lang.String	getOperatorSymbol()
boolean	isDnf()	Checks whether this formula is in disjunctive normal form.
FolFormula	toNnf()	Makes the negation normal form of this formula.

Methods inherited from class net.sf.tweety.logics.fol.syntax.AssociativeFolFormula

add, add, add, addAll, addAll, clear, contains, containsAll, containsQuantifier, createEmptySignature, equals, get, getAtoms, getFormulas, getFormulas, getFunctors, getPredicates, getQuantifierVariables, getTerms, getTerms, getUnboundVariables, hashCode, indexOf, isClosed, isClosed, isEmpty, isLiteral, isWellBound, isWellBound, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, retainAll, set, size, subList, substitute, substitute, toArray, toArray, toString

Methods inherited from class net.sf.tweety.logics.fol.syntax.FolFormula

combineWithAnd, combineWithOr, complement, getSignature, getUniformProbability, toDnf

Methods inherited from class net.sf.tweety.logics.commons.syntax.RelationalFormula

allGroundInstances, allSubstitutions, containsTermsOfType, exchange, getFormula, getPredicateCls, getSatisfactionRatio, isGround, isWellFormed

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface net.sf.tweety.commons.Formula

getSignature

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.List

replaceAll, sort, spliterator

Methods inherited from interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula

getPredicateCls

Constructor Detail

Disjunction

public Disjunction(java.util.Collection<? extends RelationalFormula> formulas)

Creates a new disjunction with the given inner formulas.

Parameters:

formulas - a collection of formulas.

Disjunction

public Disjunction()

Creates a new (empty) disjunction.

Disjunction

public Disjunction(RelationalFormula first,
                   RelationalFormula second)

Creates a new disjunction with the two given formulae

Parameters:

first - a relational formula.

second - a relational formula.

Method Detail

isDnf

public boolean isDnf()

Description copied from class: FolFormula

Checks whether this formula is in disjunctive normal form.

Specified by:

isDnf in class FolFormula

Returns:

"true" iff this formula is in disjunctive normal form.

toNnf

public FolFormula toNnf()

Description copied from class: FolFormula

Makes the negation normal form of this formula.

Specified by:

toNnf in class FolFormula

Returns:

the NNF of this formula

collapseAssociativeFormulas

public RelationalFormula collapseAssociativeFormulas()

Description copied from class: FolFormula

This method collapses all associative operations appearing in this term, e.g. every a||(b||c) becomes a||b||c.

Specified by:

collapseAssociativeFormulas in class FolFormula

Returns:

the collapsed formula.

clone

public Disjunction clone()

Description copied from interface: SimpleLogicalFormula

Creates a deep copy of this formula

Specified by:

clone in interface ComplexLogicalFormula

Specified by:

clone in interface SimpleLogicalFormula

Specified by:

clone in class FolFormula

Returns:

the cloned formula

createEmptyFormula

public Disjunction createEmptyFormula()

Returns:

an empty version of the AssociativeFormula

getOperatorSymbol

public java.lang.String getOperatorSymbol()

Returns:

A String representing the operator which connects two items of the associative formula.

getEmptySymbol

public java.lang.String getEmptySymbol()

Returns:

A String representing an empty version of the Associative Formula implementation