I wanted to write a comment, but the comment by tchow8 already sums it up nicely: > Okay, I’ll bite. You wrote, “What I do not always get is some totally obvio

I wanted to write a comment, but the comment by tchow8 already sums it up nicely: > Okay, I’ll bite. You wrote, “What I do not always get is some totally obvious ideas. Does this make any sense? Here is an example.” How is what you say about recurrences an example of a totally obvious idea, or of not getting a totally obvious idea? I don’t understand.