Let Gbe a simple graph with at least 11l vertices, and let G be its complement. (i) Prove that Gand Ğ cannot both be planar. (In fact, a similar result holds if 11 is replaced by 9, though this is difficult to prove.) (ii) Find a graph G with eight vertices for which Gand Ğ are both planar. 4.19

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Let Gbe a simple graph with at least 11l vertices, and let G be its complement.
(i) Prove that Gand Ğ cannot both be planar.
(In fact, a similar result holds if 11 is replaced by 9, though this is difficult to prove.)
(ii) Find a graph G with eight vertices for which Gand Ğ are both planar.
4.19
Transcribed Image Text:Let Gbe a simple graph with at least 11l vertices, and let G be its complement. (i) Prove that Gand Ğ cannot both be planar. (In fact, a similar result holds if 11 is replaced by 9, though this is difficult to prove.) (ii) Find a graph G with eight vertices for which Gand Ğ are both planar. 4.19
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