Coding theory MOC Extended code Let be a -code with the Galois field as its alphabet. The corresponding extended code is a -code defined by adding an additional parity check digit so that the sum of all digits is always zero,1 code i.e. Properties If is a linear code with ^check , then has parity check matrix tidy | en | sembr Footnotes 1999. Introduction to coding theory, §3.2, p. 38 ↩