This page contains code and supporting material for

- Potentially stably rational del Pezzo surfaces over nonclosed fields (Yuri Tschinkel and Kaiqi Yang)

There are 4 such actions in degree 4, see [KST-1989].

- Magma code
- List of exceptional curves
- D5 orbit decompositions (3 nonconic and 1 conic types)
- E7 orbit decompositions (4 nonconic and 14 conic types)
- E8 orbit decompositions (10 conic types)