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The Holographic Principle for Black Hole
What is the holographic principle? What does that mean? Is there some kind of weird projection going on? Well, I was just before writing an introduction to a paper in the first sentence was the as yet imprecisely defined holographic principle. So nobody knows exactly what it is. But roughly speaking, it says just what we were alluding to: really all information that is in some volume of space time can be stored on the boundary of that region.