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Jun 26, 2012 at 10:00 comment added Pavel Bažant I arrived at it myself, so I am not aware of any reference to provide. It is certainly very heuristic. For example, some of the rectangles have actually negative sign. OTOH, if we know from a rigorous proof that the extra term is nonzero, this picture attributes that term to the fact that the the error rectangles overlap.
Jun 24, 2012 at 10:04 comment added vonjd @Pavel: +1: Thank you, this is really interesting. Did you arrive at this picture yourself or did you see it in a paper, book etc? Then a reference would be great. Thank you again.
Jun 24, 2012 at 0:00 comment added Joseph O'Rourke (I included the image whose URL was cited.)
Jun 23, 2012 at 23:59 history edited Joseph O'Rourke CC BY-SA 3.0
Incorporated image.
Jun 23, 2012 at 11:38 history answered Pavel Bažant CC BY-SA 3.0