1
$\begingroup$

It is known that the Grötzsch graph is 4-coloring.

Hence it contains a subdivision of K4.

But where is this subdivision?

the Grötzsch graph

$\endgroup$
1
$\begingroup$

a is joined to b, e, f.

b is joined to e via j, and to f via h and k.

e is joined to f via g.

So a, b, e, f is a $K_4$, subdivided at j, h, k, and g.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.