Tautology

java.lang.Object
- net.sf.tweety.logics.commons.syntax.RelationalFormula
- - net.sf.tweety.logics.fol.syntax.FolFormula
  - - net.sf.tweety.logics.fol.syntax.SpecialFormula
    - - net.sf.tweety.logics.fol.syntax.Tautology

All Implemented Interfaces:

Formula, ClassicalFormula, ComplexLogicalFormula, Conjunctable, Disjunctable, Invertable, LogicStructure, ProbabilityAware, QuantifiedFormula, SimpleLogicalFormula
```
public class Tautology
extends SpecialFormula
```
A tautological formula.

Author:

Matthias Thimm

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Tautology()
  Creates a new tautology.
- Method Summary
  
  Modifier and Type Method Description
  
  Tautology clone()
  Creates a deep copy of this formula
  
  boolean equals(java.lang.Object obj)
  
  int hashCode()
  
  java.lang.String toString()
  - Methods inherited from class net.sf.tweety.logics.fol.syntax.SpecialFormula
    collapseAssociativeFormulas, containsQuantifier, getAtoms, getConjunctions, getDisjunctions, getFunctors, getPredicates, getQuantifiedFormulas, getTerms, getTerms, getUnboundVariables, isClosed, isClosed, isDnf, isLiteral, isWellBound, isWellBound, substitute, toNnf
  - Methods inherited from class net.sf.tweety.logics.fol.syntax.FolFormula
    combineWithAnd, combineWithOr, complement, getQuantifierVariables, getSignature, getUniformProbability, toDnf
  - Methods inherited from class net.sf.tweety.logics.commons.syntax.RelationalFormula
    allGroundInstances, allSubstitutions, containsTermsOfType, exchange, getFormula, getPredicateCls, getSatisfactionRatio, isGround, isWellFormed, substitute
  - Methods inherited from class java.lang.Object
    getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Tautology
```
public Tautology()
```
    Creates a new tautology.
- Method Detail
  - toString
```
public java.lang.String toString()
```
    Specified by:
    
    toString in class RelationalFormula
  - 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
  - clone
```
public Tautology 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
    
    Returns:
    
    the cloned formula