For the next three hundred years, π would reign supreme in mathematics as perhaps the single most well known constant ever. However, for several years, Euler debated whether to use π to indicate the circumference of a circle divided by the diameter (a ratio of about 3.1415927…) or to indicate the circumference divided by the ratio (a ratio of 6.2831854…). His decision, ultimately, to go with the former may have complicated mathematics far more than he’d planned.
Ontologists, especially neophyte data modelers, often get caught up in the definition of classes, wanting to treat everything as a class. However, there are two types of things that don’t actually fit cleanly into traditional distinctions of class: roles and categorizations. I’m not going to keep the focus of this article on roles, preferring to treat categorizations separately, though they have a lot of overlap.
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