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      Apply a simple criterion to check whether the formulas so far are not valid (there are still countermodels)
 
      
    
      Apply a simple criterion to check whether the formulas so far are valid
 
      
    
      
     
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
       
      
    
      (Since version ) see corresponding Javadoc for more information.