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    Status von nstr (rtsn@gnusocial.de) auf Thursday, 12-Oct-2017 16:26:51 CEST nstr nstr
    "In mathematics, the category number of a mathematician is a humorous construct invented by Dan Freed, intended to measure the capacity of that mathematician to stomach the use of higher categories. It is defined as the largest number n such that he or she can think about n-categories for a half hour without getting a splitting headache." Mine is like n=1 or on a really good day n=2 :D