digraph G {
	a_1 [texlbl="$\frac{\gamma}{2x^2+y^3}$"];
	a_1 -> a_2 -> a_3 -> a_1
	node [texmode="math"];
	a_1 -> b_1 -> b_2 -> a_3;
	b_1 [label="\\frac{\\gamma}{x^2}"];
	node [texmode="verbatim"]
	b_4 [label="\\beta"] 
	a_3 -> b_4 -> a_1;
}