[[http://f.javier.io/public/books/The%20Elements%20of%20Computing%20Systems.pdf|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