theorem Th65: :: REAL_3:65

for n being Nat
for r being Real st ( for n being Nat holds (c_d r) . n <> 0 ) holds
(((c_n r) . (n + 1)) / ((c_d r) . (n + 1))) - (((c_n r) . n) / ((c_d r) . n)) = ((- 1) |^ n) / (((c_d r) . (n + 1)) * ((c_d r) . n))