Tussupov, J.A.; Jetpisov, K.J.; Satekbaeva, A.J.; Jalmagambetova, L.М.
(Ye.A.Buketov Karaganda State University Publishing house, 2012)
We constructed a method of definability a family of sets to the oriented graph. Using this method we proved next results: Let A structure of the signature a of the 2 nilpotent group. For each computable ordinal a there is ...