net.sf.tweety.logics.fol.syntax

Class ExistsQuantifiedFormula

java.lang.Object

net.sf.tweety.logics.fol.syntax.RelationalFormula

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

net.sf.tweety.logics.fol.syntax.QuantifiedFormula

net.sf.tweety.logics.fol.syntax.ExistsQuantifiedFormula

All Implemented Interfaces:

Formula, ClassicalFormula, ComplexLogicalFormula, Conjuctable, Disjunctable, Invertable, LogicStructure, ProbabilityAware, QuantifiedFormula, SimpleLogicalFormula

public class ExistsQuantifiedFormula
extends QuantifiedFormula

Constructor Summary

Constructors

Constructor and Description
ExistsQuantifiedFormula(ExistsQuantifiedFormula other)
ExistsQuantifiedFormula(FolFormula folFormula, Variable variable) Creates a new exists-quantified formula with the given formula and variable.
ExistsQuantifiedFormula(RelationalFormula folFormula, java.util.Set<Variable> variables) Creates a new exists-quantified formula with the given formula and variables.

Method Summary

Modifier and Type	Method and Description
ExistsQuantifiedFormula	clone() Creates a deep copy of this formula
FolFormula	collapseAssociativeFormulas() This method collapses all associative operations appearing in this term, e.g.
ExistsQuantifiedFormula	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.
java.lang.String	toString()

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

containsQuantifier, equals, getAtoms, getFormula, getFunctors, getPredicates, getQuantifiedFormulas, getQuantifierVariables, getTerms, getTerms, getUnboundVariables, hashCode, isClosed, isClosed, isDnf, isLiteral, isWellBound, isWellBound

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

combineWithAnd, combineWithOr, complement, getUniformProbability, toDnf

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

allGroundInstances, allSubstitutions, containsTermsOfType, exchange, getPredicateCls, getSatisfactionRatio, getSignature, isGround, isWellFormed, substitute

Methods inherited from class java.lang.Object

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

Constructor Detail

ExistsQuantifiedFormula

public ExistsQuantifiedFormula(RelationalFormula folFormula,
                               java.util.Set<Variable> variables)

Creates a new exists-quantified formula with the given formula and variables.

Parameters:

folFormula - the formula this for-all-quantified formula ranges over.

variables - the variables of this for-all-quantified formula.

ExistsQuantifiedFormula

public ExistsQuantifiedFormula(FolFormula folFormula,
                               Variable variable)

Creates a new exists-quantified formula with the given formula and variable.

Parameters:

folFormula - the formula this for-all-quantified formula ranges over.

variable - the variable of this for-all-quantified formula.

ExistsQuantifiedFormula

public ExistsQuantifiedFormula(ExistsQuantifiedFormula other)

Method Detail

substitute

public ExistsQuantifiedFormula 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

Specified by:

substitute in class FolFormula

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 FolFormula 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.

toString

public java.lang.String toString()

Specified by:

toString in class RelationalFormula

clone

public ExistsQuantifiedFormula 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