1.NounA power series in several variables
P
:
K
d
→
K
{\displaystyle P:K^{d}\rightarrow K}
(with
K
{\displaystyle K}
a field) of the form
P
(
x
)
=
Σ
α
∈
N
d
c
α
x
α
{\displaystyle P(x)=\Sigma _{\alpha \in \mathbb {N} ^{d}}c_{\alpha }x^{\alpha }}
whose coefficients are bounded in some specific sense.