Shaoming Guo, Changkeun Oh, J. Roos, Po-Lam Yung, Pavel Zorin-Kranich
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Decoupling for two quadratic forms in three variables: a complete characterization
We prove sharp decoupling inequalities for all degenerate surfaces of codimension two in $\mathbb{R}^5$ given by two quadratic forms in three variables. Together with previous work by Demeter, Guo, and Shi in the non-degenerate case (arXiv:1609.04107), this provides a classification of decoupling inequalities for pairs of quadratic forms in three variables.