00365nam a2200121Ia 4500020001800000082001600018100001300034245003700047250001200084260004500096300001900141650008300160  a9780070669130  a511 LIU-E R  aC.L .Liu  aElements of Discrete Mathematics  a2nd ed.  bMcGrawHill International ,New Yorkc2000  axiv,433p 1.8cm  aElements of Discrete Mathematics  C.L .Liu  COMPUTABILITY AND FORMAL LANGUAGES