Paradox theories

[Alusair]

Are you making these up as you go along?

Nah, I'm nicking them from someone else that probably did.

EDIT:
Here, I believe, is the official "SLoT":

http://en.wikipedia.org/wiki/Novikov...ency_principle

EDIT 2:
Actually I don't think it's quite the same, but fairly similar in this regard:

The principle states that the timeline is totally fixed, and any actions taken by a time traveler were part of history all along, so it is impossible for the time traveler to "change" history in any way.