Essential idempotents and simplex codes
Gladys Chalom, Raul Antônio Ferraz, César Polcino Milies · Journal of Algebra Combinatorics Discrete Structures and Applications · 2017
We define essential idempotents in group algebras and use them to prove that every mininmal abelian non-cyclic code is a repetition code. Also we use them to prove that every minimal abelian code is equivalent to a minimal cyclic code of the same length. Finally, we show that a binary cyclic code is simplex if and only if is of length of the form $n=2^k-1$ and is generated by an essential idempotent.