about this topic:
T(G; x; y) is multiplicative over blocks; that is, if G has blocks B1,
. . . ,Bb, then
T(G; x; y) =
b
pi T(Bi, x, y)
i=1
These are a few examples that I could come up with:
G
1. nK1 = ¹Kn where 'K is the complement of K
2. Any tree
3. m loops
4. Cm
5. m jj edges
T(G, x, y)
1. 1
2. x^m
3. y^m
4. y+x+x^2+. . .+x^(m-1)
5. x+y+y^2+. . .+y^(m-1)