[petsc-users] Information on SNES

[Oliver Zacharias]

Dear Sir or Madam,

regarding your SNES-Tool one can specifiy at least three types of
accuracy which force the code to terminate. I would like know how you
have defined (and implemented) the following quantities:

a) "rtol"
b) "abstol"

The definition of the quantity "stol" is already described on one of
your manual pages. Would you also like to present a cite where to find
those definitions?
Thanks in advance,
Oliver Zacharias