Quote Originally Posted by Yuki Akuma View Post
Why do parallel universes and time loops invalidate each other?
I guess it doesn't so much as I see it, you never experience the success of your meddling with the past. If you send a probe back in time to prevent the death of a friend, you still live out the rest of your life with your friend haven't died, but you have created an alternative dimension (and all preceding ones from that decision) to have the effect.

So I guess it doesn't invalidate it. It just means that you yourself never benefit from the action.

As for should we apply this sort of reasoning to Gunnerkrigg Court specifically: Well the ether is basically Dream Logic Manifest, so probably not.