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

Class Equivalence

  • All Implemented Interfaces:
    net.sf.tweety.commons.Formula, net.sf.tweety.logics.commons.syntax.interfaces.ClassicalFormula, net.sf.tweety.logics.commons.syntax.interfaces.ComplexLogicalFormula, net.sf.tweety.logics.commons.syntax.interfaces.Conjunctable, net.sf.tweety.logics.commons.syntax.interfaces.Disjunctable, net.sf.tweety.logics.commons.syntax.interfaces.Invertable, net.sf.tweety.logics.commons.syntax.interfaces.LogicStructure, net.sf.tweety.logics.commons.syntax.interfaces.ProbabilityAware, net.sf.tweety.logics.commons.syntax.interfaces.QuantifiedFormula, net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula
    public class Equivalence
extends FolFormula
    The equivalence of first-order logic.
    Author:
    Anna Gessler

    • Constructor Summary

      Constructors 
      Constructor Description
      Equivalence​(net.sf.tweety.commons.util.Pair<net.sf.tweety.logics.commons.syntax.RelationalFormula,​net.sf.tweety.logics.commons.syntax.RelationalFormula> formulas)
      Creates a new equivalence with the given pair of formulas
      Equivalence​(net.sf.tweety.logics.commons.syntax.RelationalFormula a, net.sf.tweety.logics.commons.syntax.RelationalFormula b)
      Creates a new equivalence with the given two formulas

    • Method Summary

      Modifier and Type Method Description
      Equivalence clone()  
      net.sf.tweety.logics.commons.syntax.RelationalFormula collapseAssociativeFormulas()
      This method collapses all associative operations appearing in this term, e.g.
      boolean containsQuantifier()  
      boolean equals​(Object obj)  
      Set<? extends net.sf.tweety.logics.commons.syntax.interfaces.Atom> getAtoms()  
      net.sf.tweety.commons.util.Pair<net.sf.tweety.logics.commons.syntax.RelationalFormula,​net.sf.tweety.logics.commons.syntax.RelationalFormula> getFormulas()
      Returns the formulas of the equivalence.
      Set<net.sf.tweety.logics.commons.syntax.Functor> getFunctors()  
      Set<? extends net.sf.tweety.logics.commons.syntax.Predicate> getPredicates()  
      Set<net.sf.tweety.logics.commons.syntax.interfaces.Term<?>> getTerms()  
      <C extends net.sf.tweety.logics.commons.syntax.interfaces.Term<?>>
      Set<C>      		 getTerms​(Class<C> cls)  
      Set<net.sf.tweety.logics.commons.syntax.Variable> getUnboundVariables()  
      int hashCode()  
      boolean isClosed()  
      boolean isClosed​(Set<net.sf.tweety.logics.commons.syntax.Variable> boundVariables)  
      boolean isDnf()
      Checks whether this formula is in disjunctive normal form.
      boolean isLiteral()  
      boolean isWellBound()  
      boolean isWellBound​(Set<net.sf.tweety.logics.commons.syntax.Variable> boundVariables)  
      void setFormulas​(net.sf.tweety.commons.util.Pair<net.sf.tweety.logics.commons.syntax.RelationalFormula,​net.sf.tweety.logics.commons.syntax.RelationalFormula> formulas)
      Sets the formulas of the equivalence.
      FolFormula substitute​(net.sf.tweety.logics.commons.syntax.interfaces.Term<?> v, net.sf.tweety.logics.commons.syntax.interfaces.Term<?> t)  
      FolFormula toNnf()
      Makes the negation normal form of this formula.
      String toString()  

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

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

    • Constructor Detail

      • Equivalence

        public Equivalence​(net.sf.tweety.logics.commons.syntax.RelationalFormula a,
                   net.sf.tweety.logics.commons.syntax.RelationalFormula b)
        Creates a new equivalence with the given two formulas
        Parameters:
        a - a formula
        b - a formula

      • Equivalence

        public Equivalence​(net.sf.tweety.commons.util.Pair<net.sf.tweety.logics.commons.syntax.RelationalFormula,​net.sf.tweety.logics.commons.syntax.RelationalFormula> formulas)
        Creates a new equivalence with the given pair of formulas
        Parameters:
        formulas - a pair of formulas

    • Method Detail

      • getFormulas

        public net.sf.tweety.commons.util.Pair<net.sf.tweety.logics.commons.syntax.RelationalFormula,​net.sf.tweety.logics.commons.syntax.RelationalFormula> getFormulas()
        Returns the formulas of the equivalence.
        Returns:
        the formulas that are part of the equivalence

      • setFormulas

        public void setFormulas​(net.sf.tweety.commons.util.Pair<net.sf.tweety.logics.commons.syntax.RelationalFormula,​net.sf.tweety.logics.commons.syntax.RelationalFormula> formulas)
        Sets the formulas of the equivalence.
        Parameters:
        formulas - the formulas

      • getPredicates

        public Set<? extends net.sf.tweety.logics.commons.syntax.Predicate> getPredicates()

      • isLiteral

        public boolean isLiteral()

      • getUnboundVariables

        public Set<net.sf.tweety.logics.commons.syntax.Variable> getUnboundVariables()

      • containsQuantifier

        public boolean containsQuantifier()

      • isWellBound

        public boolean isWellBound()

      • isWellBound

        public boolean isWellBound​(Set<net.sf.tweety.logics.commons.syntax.Variable> boundVariables)

      • isClosed

        public boolean isClosed()

      • isClosed

        public boolean isClosed​(Set<net.sf.tweety.logics.commons.syntax.Variable> boundVariables)

      • getTerms

        public Set<net.sf.tweety.logics.commons.syntax.interfaces.Term<?>> getTerms()

      • getTerms

        public <C extends net.sf.tweety.logics.commons.syntax.interfaces.Term<?>> Set<C> getTerms​(Class<C> cls)

      • 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 net.sf.tweety.logics.commons.syntax.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.

      • 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.

      • clone

        public Equivalence clone()
        Specified by:
        clone in interface net.sf.tweety.logics.commons.syntax.interfaces.ComplexLogicalFormula
        Specified by:
        clone in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula
        Specified by:
        clone in class FolFormula

      • getAtoms

        public Set<? extends net.sf.tweety.logics.commons.syntax.interfaces.Atom> getAtoms()
        Specified by:
        getAtoms in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula
        Specified by:
        getAtoms in class net.sf.tweety.logics.commons.syntax.RelationalFormula

      • getFunctors

        public Set<net.sf.tweety.logics.commons.syntax.Functor> getFunctors()
        Specified by:
        getFunctors in class net.sf.tweety.logics.commons.syntax.RelationalFormula

      • toString

        public String toString()
        Specified by:
        toString in class net.sf.tweety.logics.commons.syntax.RelationalFormula

      • hashCode

        public int hashCode()
        Specified by:
        hashCode in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula
        Overrides:
        hashCode in class Object

      • equals

        public boolean equals​(Object obj)
        Specified by:
        equals in interface net.sf.tweety.logics.commons.syntax.interfaces.SimpleLogicalFormula
        Overrides:
        equals in class Object