\(\mathbb{Z }_2\mathbb{Z }_4\)-Additive formally self-dual codes
We study odd and even \(\mathbb{Z }_2\mathbb{Z }_4\) formally self-dual codes. The images of these codes are binary codes whose weight enumerators are that of a formally self-dual code but may not be linear. Three constructions are given for formally self-dual codes and existence theorems are given for codes of each type defined in the paper.
formally self-dual codes type i codes type ii codes \(\mathbb{z }_2\mathbb{z }_4\)-additive codes 94b60 94b25