I will never go back to my old life, my old me does not exist anymore, and yet I could not be who I am now if I didn't know this person and his mistakes so well.

r' can be many things, a derivative of a function, an element of the range of an operator Ar=r', for example a mirrored point in R^2 using the mirror matrix of any axis. It may also be the dual of a room, defined as B(r,\doubleK), if r is complete vector space. In general I like to call r' the different element of r, because I've always thought and wanted to think that r'\neq r. But in reality I don't know at all, I can just define that for myself, r' unequals r in any case. I like the concept of existence, because existence in fact is not clear at all, and as a result, it's interesting to try to think it through. The fact is nothing is for us, except the illusion that every one of us gets thrown at. I stopped thinking that things are what they are, quite a while ago. Because they truly just are what they seem to be, and their existence depends on the viewer.

Recently I liked to think about that everything might be the same, and to see it as the opposite state of when everything is different from another thing. It is a psychologically and philosophically powerful rational idea as it seems to me, because it can lead to new places of thought.