Keywords: gradient-type system, Heisenberg group, variational methods, principle of symmetric criticality, symmetric solutionsFull text (file, 430,81 KB)
Keywords: graph theory, graphs, cubic graphs, symmetric graphs, ▫$s$▫-regular group, regular covering projectionFull text (outside link)
Keywords: mathematics, bicyclic semigroup, semigroup of bijective partial transformations, congruence, symmetric group, group congruence, semidirect productFull text (file, 611,30 KB)
Keywords: minimal ▫$PD_4$▫-complex, order relation, symmetric L-groupFull text (file, 616,26 KB)