========================================= Documentation for previous PETSc releases ========================================= .. toctree:: :maxdepth: 1 3.21 3.20 3.19 3.18 3.17 3.16 3.15 3.14 3.13 3.12 3.11 3.10 3.9 3.8 3.7 3.6 3.5 3.4 3.3