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java.lang.Object de.uni_tuebingen.sfb.lichtenstein.formulas.FormulaImpl de.uni_tuebingen.sfb.lichtenstein.formulas.ComposedFormula de.uni_tuebingen.sfb.lichtenstein.formulas.BinaryJunctor de.uni_tuebingen.sfb.lichtenstein.formulas.Equivalence
public class Equivalence
A class representing the equivalence in logical formulas. TODO: remove this class once the template system works. Then store it as a permanent template?
Constructor Summary | |
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Equivalence(Formula first,
Formula second)
Initialize a new equivalence between two formulas. |
Method Summary | |
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void |
accept(FormulaVisitor visitor)
Accept a formula visitor. |
Conjunction |
getEquivalentFormula()
Returns a formula which is equivalent to this equivalence: (first -> second) & (second -> first) . |
Conjunction |
getNormalForm()
Get a normal form with only conjunction, disjunction, negation and existential quantification. |
String |
getSymbol()
Return the textual representation of this binary junctor. |
Methods inherited from class de.uni_tuebingen.sfb.lichtenstein.formulas.BinaryJunctor |
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containsVariable, equals, getFirstArgument, getFirstIndexOf, getNbBoundVariables, getNbFreeVariables, getNbSubformulas, getNbVariables, getPredicates, getSecondArgument, getSubformulaAt, getVariableAt, hashCode, isFreeVariable, toString |
Methods inherited from class de.uni_tuebingen.sfb.lichtenstein.formulas.ComposedFormula |
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getAllSubformulas |
Methods inherited from class de.uni_tuebingen.sfb.lichtenstein.formulas.FormulaImpl |
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and, exists, exists, forAll, forAll, getFreeVariables, getVariables, iff, implies, isClosed, not, or |
Methods inherited from class java.lang.Object |
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getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Equivalence(Formula first, Formula second)
first
- The first formula.second
- The second formula.| new.getFirstArgument() == first
| new.getSecondArgument() == second
Method Detail |
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public Conjunction getEquivalentFormula()
(first -> second) & (second -> first)
.
| result.getFirstArgument() in
Implication &&
| result.getSecondArgument() in Implication && |
result.getFirstArgument().getFirstArgument() == getFirstArgument() &&
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result.getFirstArgument().getSecondArgument() == getSecondArgument() &&
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result.getSecondArgument().getFirstArgument() == getFirstArgument() &&
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result.getSecondArgument().getFirstArgument() == getSecondArgument()
public Conjunction getNormalForm()
| result == getEquivalentFormula().getNormalForm()
public String getSymbol()
getSymbol
in class ComposedFormula
public void accept(FormulaVisitor visitor) throws de.uni_tuebingen.sfb.lichtenstein.exceptions.VisitorException
accept
in interface Visitable
accept
in class FormulaImpl
visitor
- The visitor that is to be accepted to do its work.
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