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We propose a new characterization of NP using square span programs (SSPs). We first characterize NP as affine map constraints on small vectors. We then relate this characterization to SSPs, which are similar but simpler than Quadratic Span Programs (QSPs) and Quadratic Arithmetic Programs (QAPs) since they use a single series of polynomials rather than 2 or 3.

Square Span Programs with Applications to Succinct NIZK Arguments