| http://www.w3.org/ns/prov#value | - However, continuing to be fairly casual about the use of words, it seems to me that there are at a minimum the following categories:1) Things we know with certainty because they cannot be other than true (such as 2+2=4)2) Things we know with certainty by direct observation (such as there is a tree there or that vase is blue)3) Things we think to be correct based on rational assessment of evide
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