Rock750 wrote:
The first equation is given in the fact statement OK But what about the transition from the first to the second ?
I think u factorized by a_4 from both the two parts of the equation which must lead to the following :
a_1*a_2*....a_4*a_5....a_9 = a_4 \to (a_1*a_2*...a_5....a_9) = 1.
Am I missing something here ?
Yes, we cannot cancel a_4 from both sides because a_4 can be zero.