> “Free Will” is a philosophical term of art for a particular sort of capacity of rational agents to choose a course of action from among various alternatives. Which sort is the free will sort is what all the fuss is about. (And what a fuss it has been: philosophers have debated this question for over two millennia, and just about every major philosopher has had something to say about it.)
The first three sections after that (1.1, 1.2, 1.3) are about different definitions of free will. Where did you get the idea that free will had a settled definition? Is there something else I should be reading?
>If there is such a thing as free will, it has many dimensions. In what follows, I will sketch the freedom-conferring characteristics that have attracted most of the attention
What is your definition of free will such that mainstream science says that we do not have it? In general, I'd recommend always stating your definition of free will when discussing it, because people's definitions differ.
Given that definition, how would the world look if we did have it, and if we didn't? (You are part of the world, so your inner feelings count, if that's all you think would differ.)
How sure are you that the world looks the first way, and not the second way?