Definition:Operations on Polynomial Ring of Sequences
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Definition
Let $\struct {R, +, \circ}$ be a ring.
Let $P \sqbrk R$ be the set of all sequences in $R$:
- $P \sqbrk R = \set {\sequence {r_0, r_1, r_2, \ldots} }$
such that each $r_i \in R$, and all but a finite number of terms is zero.
The operations ring addition $\oplus$, ring negative, and ring product $\odot$ on $P \sqbrk R$ are defined as follows:
\((1)\) | $:$ | Ring Addition: | \(\ds \sequence {r_0, r_1, r_2, \ldots} \oplus \sequence {s_0, s_1, s_2, \ldots} \) | \(\ds = \) | \(\ds \sequence {r_0 + s_0, r_1 + s_1, r_2 + s_2, \ldots} \) | ||||
\((2)\) | $:$ | Ring Negative: | \(\ds -\sequence {r_0, r_1, r_2, \ldots} \) | \(\ds = \) | \(\ds \sequence {-r_0, -r_1, -r_2, \ldots} \) | ||||
\((3)\) | $:$ | Ring Product: | \(\ds \sequence {r_0, r_1, r_2, \ldots} \odot \sequence {s_0, s_1, s_2, \ldots} \) | \(\ds = \) | \(\ds \sequence {t_0, t_1, t_2, \ldots} \) | where $\ds t_i = \sum_{j \mathop + k \mathop = i} r_j \circ s_k$ |
Also see
Sources
- 1970: B. Hartley and T.O. Hawkes: Rings, Modules and Linear Algebra ... (previous) ... (next): $\S 3.2$: Polynomial rings: Definition $3.4$