PDEs

• Family of surfaces — T2
• Quasilinear first-order PDEs (Lagrange's method) — T2
• Cauchy's method of characteristics — T3
• Classification and reduction to canonical form — T1
• Second-order linear PDEs with constant coefficients (CF, PI) — T1
• Wave equation — T2
• Heat equation — T3
• Laplace equation: Dirichlet/Neumann, separation of variables — T3
• Charpit's method — T3