Symbols

• Single and multicharacter symbols

  a, b, c, � , +Adj, +SG, ^Fin
  

• Special symbols

  0 EPSILON
  
  ? ANY

• Symbols vs. symbol pairs

  • In general, no distinction is made between
    a the language {�a�}
    
    a:a the identity relation {<�a�, �a�>}

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