Split isomorphism

Split isomorphism --- расщепленный изоморфизм.

Let [math]\displaystyle{ (G,A,B) }[/math] and [math]\displaystyle{ (H,C,D) }[/math] be split graphs and let [math]\displaystyle{ f }[/math] be an isomorphism of [math]\displaystyle{ G }[/math] onto [math]\displaystyle{ H }[/math]. [math]\displaystyle{ f }[/math] is called a split isomorphism, if [math]\displaystyle{ f(A) = C }[/math] and [math]\displaystyle{ f(B) = D }[/math].