This is pretty much my least favorite field of math, I have a kind of shamefully weak background here, and I only picked this up because I had to backfill gaps to prove convergence (iterative procedures, blah blah blah). But the truth is it's been pretty interesting reading up on this stuff. Not my specialty at all, but I think I start to see the appeal (it's like applied analysis, or a theory of numerical tricks). And believe me nothing else I've seen on numerical methods ever made me see the appeal. Maybe I can stop avoiding this stuff like the plague?