05C10 4 05C25 3 planar graph 2 power graph 2 05C15 1 05C40 1 1-planar graph 1 13A10 1 Primary 05C25 1 \(1\)-planar graph 1 almost planar graph 1 chromatic number 1 commutative ring 1 connectivity 1 cyclic group 1 dicyclic group 1 dihedral group 1 double-toroidal graph 1 energy of a graph 1 isoclinism 1 maximal planar graph 1 nilradical graph 1 non-commuting graph 1 non-nilradical graph 1 outerplanar graph 1 planarity 1 projective graph 1 ring graph 1 toroidal graph 1 zero-divisor graph 1