# Archived enhancement proposals

Enhancement proposals that are final, rejected, withdrawn or superseded. A final SEP is
the record of how its functionality was proposed, built and verified; it is not updated
to follow later changes, which the manual describes ([SEP 0](../sep-0000-process.md) §6).

```{toctree}
:maxdepth: 1

sep-0003-optmat-materials
sep-0006-dispersive-nonlinearity
sep-0012-tdse-nonlinear-response
sep-0013-expensive-response-steppers
sep-0014-stepper-efficiency
sep-0015-exponential-adams
sep-0016-unified-multistep
sep-0018-band-exact-plasma-integrals
sep-0019-field-scale-quadrature
sep-0020-hacc-helium-tdse
sep-0022-memory-lean-spatial-execution
sep-0023-far-field-aperture-spectra
sep-0024-low-storage-interaction-picture-runge-kutta
sep-0025-rounding-level-reproducibility
sep-0026-edge-free-tdse-source
sep-0027-held-plasma-current
sep-0028-free-space-evaluation
sep-0029-compiled-backend-distribution
sep-0030-standard-benchmark-suite
sep-0031-simulation-coupling
sep-0033-single-precision-mlx
sep-0034-medium-flux
sep-0035-carrier-frame-exponential-adams
```