Before continuing from my prior post, let me remind you that the iterative nature of the ULA will result in books containing a true history of the periodic universe. Every true detail, every true idea, every true thought, every true event-as-happens will be written down somewhere in the Universal Library. I’m not writing about a human author writing a true historical book. Rather, I write about a purely mathematical construction repeated indefinitely, which then writes the contents of the Universal Library’s books. That fact remands the contents to being true where there is an “a priori/a posteriori necessity.”

Consider everything else suspect. Interesting! But suspect.

So how do we locate such 'a priori/a posteriori necessities'? Here's a teaser from Lewis Carroll's Through the Looking Glass ~

     "The rule is, jam to-morrow and jam yesterday—but never jam to-day."
     "It MUST come sometimes to 'jam to-day,'" Alice objected.
     "No, it can't," said the Queen. "It's jam every OTHER day: to-day isn't any OTHER day, you know."
     "I don't understand you," said Alice. "It's dreadfully confusing!"
     "That's the effect of living backwards," the Queen said kindly: "it always makes one a little giddy at first—"
     "Living backwards!" Alice repeated in great astonishment. "I never heard of such a thing!"
     "—but there's one great advantage in it, that one's memory works both ways."
     "I'm sure MINE only works one way," Alice remarked. "I can't remember things before they happen."
     "It's a poor sort of memory that only works backwards," the Queen remarked.