Polynomial time deterministic identity testingalgorithm for $\Sigma^{[3]}\Pi\Sigma\Pi^{[2]}$ circuits via Edelstein-Kelly type theorem for quadratic polynomials

Abstract

In this work we resolve conjectures of Beecken, Mitmann and Saxena [BMS13] and Gupta [Gup14], by proving an analog of a theorem of Edelstein and Kelly for quadratic polynomials. As immediate corollary we obtain the first deterministic polynomial time black-box algorithm for testing zeroness of $\Sigma^{[3]}\Pi\Sigma\Pi^{[2]}$ circuits.