The elements of computing systems, building a modern computer from first principles, Noam Nisan, Shimon Schocken, 1998

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All logic formules can be described by 3 basic operations

  AND OR NOT

However, due to Morgan law, they can be condensed to only two operations, either

  AND NOT | OR NOT
      OR  =
      AND =

The resulting two operations can be integrated into one single logic gate

  NAND | NOR

These single gates can be used to design and build a complete computer, on this book the NAND gate has been selected