Encyclopaedia Index
Declaring logical constants
       -  Click on
            
            [Variable settings]
            button in the bottom bar of the
            
            dialog box.
       
 -  Scroll down in
            
            'Name' of 'Logical Ground variables' to view their list.
       
 -  Select the name, e.g.
            
            LG(3).
       
 -  Click the button
            
            'Value', to select, e.g. F.