[ even without his knowledge of time travel and whether or not it's even possible (though, on account of the things he's come to see are possible here, he's come to trust that the doctor nor clara would be lying about the whole thing), he can grasp the idea of its complication, of how even a time traveler might be skeptical about a proclamation that the regrets of some several dozen people could be changed in an instant. ]
And how you even determine what a fixed point is? Shouldn't everything theoretically be a fixed point?
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And how you even determine what a fixed point is? Shouldn't everything theoretically be a fixed point?