Hammock presentation

Hammock presentation --- гамачное представление.

Let [math]\displaystyle{ G }[/math] be a cf-graph and [math]\displaystyle{ \Gamma_G }[/math] denote the set of all nontrivial prime and composite hammocks of [math]\displaystyle{ G }[/math]. [math]\displaystyle{ \Gamma_G }[/math] -representation of [math]\displaystyle{ G }[/math] (i.e. [math]\displaystyle{ A }[/math]-representation of [math]\displaystyle{ G }[/math] for [math]\displaystyle{ A= }[/math] [math]\displaystyle{ \Gamma_G }[/math]) is called a hammock representation of [math]\displaystyle{ G }[/math].