| D03EEF | Discretize a second-order elliptic PDE on a rectangle |
| D03PYF | PDEs, spatial interpolation with D03PDF or D03PJF |
| D03PZF | PDEs, spatial interpolation with D03PCF, D03PEF, D03PFF, D03PHF, D03PKF, D03PLF, D03PPF, D03PRF or D03PSF |
| I2b4a: | Domain triangulation (search also class P) | (10 routines) |
| I2b4b: | Solution of discretized elliptic equations | (5 routines) |