An introduction to digital logic
Binary systems also have a long history in logical discourse and argument, where the states are called ‘true’ and ‘false’. Thus the statement that the ‘earth is spherical’ would be assigned the binary state ‘true’. In fact a whole algebra based on these states, known as Boolean algebra, was developed for the analysis of logical debate during the early nineteenth century. Thus the use of binary systems in computers has its roots in a theory developed to serve this logical analysis, and this is why the circuitry used in a computer is still often referred to as ‘binary logic’.