We prove that any completely regular code with minimum eigenvalue in geometric graph Γ corresponds to a the clique of Γ. Studying interrelation these codes, complete characterization codes Johnson graphs J(n,w) covering radius w−1 and strength 1 is obtained. In particular this result finishes J(n,3). also classify J(n,4) only one case for eigenvalues left open.

We introduce regular charts as physical reference frames in spacetime, and we show that general spacetimes can always be fully captured by regular charts. Effective quantum field theories (QFTs) can be conveniently defined in regular reference frames, and the definition is independent of specific background metric and independent of specific regular reference frame. As a consequence, coupling t...

The objective of this review to be submitted in two independent parts, for steel frames and for RC frames, is to compare their structural performance with respect to the proposed N2-method, and so also of the consequent convenience of using pushover methodology for the seismic analysis of these structures. A preliminary investigation is presented on a pushover analysis used for the seismic perf...