[petsc-users] SNES without SNESSetJacobian, snes_fd or snes_mf

[Florian Kauer]

Hi,
what is the SNES solver actually doing when you do not provide a 
jacobian and not explicitly select either finite differencing 
approximation or matrix-free Newton-Krylov method?

I just noticed that I mistakenly did this, but a good solution is found 
anyway (and fast). So what is actually happening? Simple fixed-point 
iteration?

Greetings,
Florian