net.sf.tweety.logics.fol.syntax

Class Conjunction

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.Conjunction

All Implemented Interfaces:

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

public class Conjunction
extends AssociativeFOLFormula

The classical conjunction of first-order logic.

Author:

Matthias Thimm

Field Summary

Fields inherited from class net.sf.tweety.logics.fol.syntax.AssociativeFOLFormula

support

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
Conjunction	clone() Creates a deep copy of this formula
RelationalFormula	collapseAssociativeFormulas() This method collapses all associative operations appearing in this term, e.g.
Conjunction	createEmptyFormula()
java.lang.String	getEmptySymbol()
java.lang.String	getOperatorSymbol()
boolean	isDnf() Checks whether this formula is in disjunctive normal form.
Conjunction	substitute(Term<?> v, Term<?> t) Substitutes all occurrences of term "v" in this formula by term "t" and returns the new formula.
FolFormula	toNnf() Makes the negation normal form of this formula.

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

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, 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

finalize, getClass, notify, notifyAll, wait, wait, wait

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

getPredicateCls

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

getSignature

Methods inherited from interface java.util.List

replaceAll, sort, spliterator

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

Conjunction

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

Creates a new conjunction with the given inner formulas.

Parameters:

formulas - a collection of formulas.

Conjunction

public Conjunction()

Creates a new (empty) conjunction.

Conjunction

public Conjunction(RelationalFormula first,
                   RelationalFormula second)

Creates a new conjunction 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.

substitute

public Conjunction substitute(Term<?> v,
                              Term<?> t)
                       throws java.lang.IllegalArgumentException

Description copied from class: RelationalFormula

Substitutes all occurrences of term "v" in this formula by term "t" and returns the new formula. NOTE: if "v" is a variable and bound to a quantifier then "v" is not substituted in that quantifiers inner formula.

Specified by:

substitute in interface ComplexLogicalFormula

Overrides:

substitute in class AssociativeFOLFormula

Parameters:

v - the term to be substituted.

t - the term to substitute.

Returns:

a formula where every occurrence of "v" is replaced by "t".

Throws:

java.lang.IllegalArgumentException - if "v" and "t" are of different sorts (NOTE: this exception is only thrown when "v" actually appears in this formula).

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 Conjunction 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

createEmptyFormula

public Conjunction 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