"Of course it does not mean it is easy nor straightforward, but at least it does not necessitate to totally rethink your problem..."
would be replaced by
"Of course it does not mean it is easy or straightforward, but at least it does not necessitate totally rethinking your problem..."
In the fourth sentence: "most simple" should be "simplest". My personal preference here would be to replace "the simplest example" by "a simple example", but then it is no longer a suggested correction!
Section 4.1 Introduction
"Of course it does not mean it is easy nor straightforward, but at least it does not necessitate to totally rethink your problem..."
would be replaced by
"Of course it does not mean it is easy or straightforward, but at least it does not necessitate totally rethinking your problem..."