9.1 Earlier binary ideas and combinatorial systems
Two-valued distinctions appear in many intellectual traditions. For this topic, the key issue is not finding the oldest pair of opposites but identifying positional binary arithmetic and its machine-processing lineage.
9.2 Leibniz and binary arithmetic
Leibniz published his explanation of binary arithmetic in 1703. He showed how numbers could be represented using only 0 and 1 and connected the scheme to broader philosophical interests [1].
9.3 Boolean logic
George Boole's nineteenth-century algebra formalised operations over logical classes and truth values. Later propositional logic provided a mathematical language for compound conditions [3].
9.4 Relay switching and Shannon
In 1937 Claude Shannon demonstrated that Boolean algebra could model relay and switching circuits. His thesis made logic design systematic and is widely treated as foundational for digital circuit theory [2].
9.5 Binary machines and electronic computing
Machines such as Konrad Zuse's Z3 used binary floating-point representation in electromechanical hardware, while later electronic computers adopted binary or other discrete representations according to architecture [7][8]. Binary was influential, but early electronic computing was not uniformly binary.
9.6 Character codes and ASCII
As computers exchanged text, incompatible codes became costly. ASCII standardisation in the 1960s assigned bit patterns to a limited set of characters and control functions, supporting interoperability across systems [4][9].
9.7 Unicode and global text representation
Unicode separates abstract characters from particular byte encodings and has expanded to represent writing systems worldwide. UTF-8 and other encoding forms map code points to binary sequences [5][6].
9.8 Digital media representation
Images, sound and video become binary through sampling, quantisation and coding. The process preserves selected measurements, not a complete continuous event. Resolution, bit depth and compression choices determine what survives.
9.9 Contemporary binary infrastructures
Modern networks, storage systems and processors rely overwhelmingly on binary representations, while specialised hardware may use analogue, quantum or multi-level states beneath or alongside binary interfaces.