

Can this recursive form of polynomial equation modify for Trimul?
Polynomial part:
The elementary symmetric polynomials \(e_k(x_1, \dots, x_n)\) can be defined recursively by splitting the variables: \(e_k(x_1, \dots, x_n) = e_k(x_1, \dots, x_{n-1}) + x_n e_{k-1}(x_1, \dots, x_{n-1})\) for \(1 < k < n\)
I try to figure out does it possible to apply recursive on elementry polynomial for triangle multiication. But It come out with leave one out variable method during power sum which not quite the same as trimul, they have the enumerate on sum of k in clear path like ik and jk. Do you think I can modify this elementry polynomial for trimul?