"We" when I mean "I" or should I say "the author"? I am currently working on my thesis and facing the problem of choosing between "I", "We" or "the author" when I want to talk about things I defined, decided etc. I am the only author of my thesis, but using "I" is not very common, is it? I saw quite a lot of work of single-authors that used "We" when referencing to themselves.

"The author" seems nicer to me, but it is not common?

Any recommendations or remarks?
"We" is correct, even if you are the only author, by "we" you express "me and you, my dear reader". Therefore it's completely fine to use it in your thesis.