Category:Definitions/Elementary Symmetric Functions
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This category contains definitions related to Elementary Symmetric Functions.
Related results can be found in Category:Elementary Symmetric Functions.
Let $a, b \in \Z$ be integers such that $b \ge a$.
Let $U$ be a set of $n = b - a + 1$ numbers $\set {x_a, x_{a + 1}, \ldots, x_b}$.
Let $m \in \Z_{>0}$ be a (strictly) positive integer.
An elementary symmetric function of degree $m$ is a polynomial which can be defined by the formula:
\(\ds \map {e_m} U\) | \(=\) | \(\ds \sum_{a \mathop \le j_1 \mathop < j_2 \mathop < \mathop \cdots \mathop < j_m \mathop \le b} \paren {\prod_{i \mathop = 1}^m x_{j_i} }\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds \sum_{a \mathop \le j_1 \mathop < j_2 \mathop < \mathop \cdots \mathop < j_m \mathop \le b} x_{j_1} x_{j_2} \cdots x_{j_m}\) |
That is, it is the sum of all products of $m$ distinct elements of $\set {x_a, x_{a + 1}, \dotsc, x_b}$.
Pages in category "Definitions/Elementary Symmetric Functions"
The following 3 pages are in this category, out of 3 total.