# Edgar F. Codd > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] places this node within the history and governance of substrate-independent evolution. **Domain:** Computer Science / Databases / Automata **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition Edgar F. Codd was a computer scientist known for the relational model of databases and for an eight-state universal-construction cellular automaton. ## Nexus Context Codd reduced von Neumann’s 29-state design while retaining universal computation and construction, though the resulting machine remained too large for contemporary simulation. ## Evidence Boundary Hutton later found and corrected errors in the published specification. Codd’s theoretical contribution and the corrected implementation should be distinguished. ## Relationships [[wiki/Relational Database|Relational Database]], [[wiki/Tim Hutton|Tim Hutton]], [[wiki/Universal Construction|Universal Construction]], [[wiki/Cellular Automata|Cellular Automata]] ## Sources / Provenance - E. F. Codd, _Cellular Automata_ (1968); Hutton (2010).