Recursion Property of Elementary Symmetric Function/Examples

Examples of Use of Recursion Property of Elementary Symmetric Function
=== Example: $x_{n + 1} \map {e_n} {\set {x_1, x_2, \ldots, x_n} } = \map {e_{n + 1} } {\set {x_1, x_2, \ldots, x_n, x_{n + 1} } }$ ===