To most contemporary mathematicians matrices and linear transformations are practically interchangeable notions . Indeed, the mainstream 'Bourbakian' establishment, with its profound disdain of the concrete, goes as far as to frown at the mere mention of the word 'matrix'. To me, however, (as well as to a growing number of mathematical dissidents c~lled 'combinatorialists') a matrix has nothing...

The past years have witnessed an increasing interest and concern regarding the development of security monitoring management mechanisms for Critical Infrastructures, due to their vital role in ensuring availability many essential services. This task is not easy specific characteristics such systems, natural resistance Infrastructures operators against actions implying downtime. Digital Twins, a...