theorem Th24: :: NUMBER17:24

for c1, c2, c3, c4, c5, c6, c7, c8 being Complex holds Sum <*c1,c2,c3,c4,c5,c6,c7,c8*> = ((((((c1 + c2) + c3) + c4) + c5) + c6) + c7) + c8