2011 | OriginalPaper | Buchkapitel
On Sums of Locally Testable Affine Invariant Properties
verfasst von : Eli Ben-Sasson, Elena Grigorescu, Ghid Maatouk, Amir Shpilka, Madhu Sudan
Erschienen in: Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques
Verlag: Springer Berlin Heidelberg
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Affine-invariant properties are an abstract class of properties that generalize some central algebraic ones, such as linearity and low-degree-ness, that have been studied extensively in the context of property testing. Affine invariant properties consider functions mapping a big field
$\mathbb{F}_{q^n}$
to the subfield
$\mathbb{F}_q$
and include all properties that form an
$\mathbb{F}_q$
-vector space and are invariant under affine transformations of the domain. Almost all the known locally testable affine-invariant properties have so-called “single-orbit characterizations” — namely they are specified by a single local constraint on the property, and the “orbit” of this constraint, i.e., translations of this constraint induced by affine-invariance. Single-orbit characterizations by a local constraint are also known to imply local testability. In this work we show that properties with single-orbit characterizations are closed under “summation”. To complement this result, we also show that the property of being an
n
-variate low-degree polynomial over
$\mathbb{F}_q$
has a single-orbit characterization (even when the domain is viewed as
$\mathbb{F}_{q^n}$
and so has very few affine transformations). As a consequence we find that the sum of any sparse affine-invariant property (properties satisfied by
q
O
(
n
)
-functions) with the set of degree
d
multivariate polynomials over
$\mathbb{F}_q$
has a single-orbit characterization (and is hence locally testable) when
q
is prime. We conclude with some intriguing questions/conjectures attempting to classify all locally testable affine-invariant properties.