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On norming systems of linear equations
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On norming systems of linear equations
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A system of linear equations $L$ is said to be norming if a natural functional $t_L(\cdot)$ giving a weighted count for the set of solutions to the system can be used to define a norm on the space of real-valued functions on $\mathbb{F}_q^n$ for every $n>0$. For example, Gowers uniformity norms arise in this way. In this paper, we initiate the systematic study of norming linear systems by proving a range of necessary and sufficient conditions for a system to be norming. Some highlights include an isomorphism theorem for the functional $t_L(\cdot)$, a proof that any norming system must be variable-transitive and the classification of all norming systems of rank at most two.
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Cited by 1 Pith paper
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Sidorenko Inequalities for Two-Sided Group Correlation Kernels
A directed kernel C_f on finite groups satisfies t(F, C_f) ≥ (E f(g))^{2e(F)} for every finite directed graph F.
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