scientific article

zbMath0558.35017MaRDI QIDQ3223216

Yuanzhong Xu

Publication date: 1984

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

analytic hypoellipticityfirst order systems

Mathematics Subject Classification ID

Linear first-order PDEs (35F05) Hypoelliptic equations (35H10)