Generalizing the Bierbrauer-Friedman bound
Generalizing the Bierbrauer-Friedman bound
We characterize mixed-level orthogonal arrays it terms of algebraic designs in a special multigraph. We prove a mixed-level analog of the Bierbrauer-Friedman (BF) bound for pure-level orthogonal arrays. For the case when the numbers of levels are powers of the same prime number, we characterize, in terms of multispreads, additive …