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

Class Implication

    • Constructor Detail

      • Implication

        public Implication​(RelationalFormula a,
                   RelationalFormula b)
        Creates a new implication a=>b with the two given formulas
        Parameters:
        a - a relational formula.
        b - a relational formula.

      • Implication

        public Implication​(Pair<RelationalFormula,​RelationalFormula> formulas)
        Creates a new implication with the given pair of formulas
        Parameters:
        formulas - a pair of formulas

    • Method Detail

      • getPredicates

        public java.util.Set<? extends Predicate> getPredicates()
        Description copied from interface: SimpleLogicalFormula
        Processes the set of all predicates which appear in this formula
        Returns:
        all predicates that appear in this formula

      • isLiteral

        public boolean isLiteral()
        Returns:
        true if the formula represents a literal in the language or false otherwise

      • getUnboundVariables

        public java.util.Set<Variable> getUnboundVariables()
        Returns:
        a set of of unbound variables

      • containsQuantifier

        public boolean containsQuantifier()
        Description copied from interface: QuantifiedFormula
        Checks whether this formula contains any quantification.
        Returns:
        "true" if this formula contains a quantification.

      • isWellBound

        public boolean isWellBound()
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is well-bound, i.e. whether no variable bound by a quantifier is again bound by another quantifier within the first quantifier's range.
        Returns:
        "true" if this formula is well-bound, "false" otherwise.

      • isWellBound

        public boolean isWellBound​(java.util.Set<Variable> boundVariables)
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is well-bound, i.e. whether no variable bound by a quantifier is again bound by another quantifier within the first quantifier range. Every variable in "boundVariables" is assumed to be bound already.
        Parameters:
        boundVariables - the variables assumed to be bound.
        Returns:
        "true" if this formula is well-bound, "false" otherwise.

      • isClosed

        public boolean isClosed()
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is closed, i.e. whether every variables occurring in the formula is bound by a quantifier.
        Returns:
        "true" if this formula is closed, "false" otherwise.

      • isClosed

        public boolean isClosed​(java.util.Set<Variable> boundVariables)
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is closed, i.e. whether every variables occurring in the formula is bound by a quantifier. Every variable in "boundVariables" is already assumed to be bound.
        Parameters:
        boundVariables - the variables assumed to be bound.
        Returns:
        "true" if this formula is closed wrt. "boundVariables", "false" otherwise.

      • getTerms

        public java.util.Set<Term<?>> getTerms()
        Returns:
        a set containing all terms of this logical structure

      • getTerms

        public <C extends Term<?>> java.util.Set<C> getTerms​(java.lang.Class<C> cls)
        Description copied from interface: LogicStructure
        Processes the set containing all terms of type C. This method uses the equals method of the given Class and therefore does not add terms which are sub classes of type C to the set.
        Type Parameters:
        C - the type of terms
        Parameters:
        cls - The Class structure containing type information about the searched term
        Returns:
        A set containing all terms of type C of this logical structure

      • 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.

      • 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 FolFormula 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).

      • hashCode

        public int hashCode()
        Specified by:
        hashCode in interface SimpleLogicalFormula
        Overrides:
        hashCode in class java.lang.Object

      • equals

        public boolean equals​(java.lang.Object obj)
        Specified by:
        equals in interface SimpleLogicalFormula
        Overrides:
        equals in class java.lang.Object