dwustosunki

[casusrad]

Niech \(\displaystyle{ \alpha = DS(P,Q; U, V )}\). Wyrazić za pomocą \(\displaystyle{ \alpha}\) dwustosunki \(\displaystyle{ DS(Q, P; U, V )}\),
\(\displaystyle{ DS(P,Q; V, U), DS(U, V ; P,Q), DS(P, U; Q, V ), DS(U,Q; P, V ) i DS(V, U;Q, P)}\).