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We do have examples of Sumerian arithmetic from as long ago as about 2100 BCE. In these cases the error should be marked as an exception; for example, if the building shown in the example was actually a shopping mall, the one building overlapping several parcels would not be an error but rather an exception to the rule. A list of topology rules for how features share geometry. Contents and Contributors Handbook of the History of general topology Volume 2 CE Aull, R.

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