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G - .

. a b G , S(a, b).

S(a, b) vi , S(vi, vi), S(a, b), vi . vi, : , , .

. G , - .

G(Vi) G(V) .

, :

) v ;

) a b ( S(a, b)), b ( S(b, a));

) b ( S1(a, b)) b ( S2(b, c)), (S1(a, b) + S2(b, c)), a c .

, G , :

, ( )

,

. .

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