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@dailectic I think the best exposition can be found in Ch.5 of https://t.co/YaL9Dgou45 Original source (Lawvere 1969): https://t.co/NDcngwwIrp Related articles: https://t.co/8ChzIEiinp https://t.co/AlLJsBhoSA https://t.co/9qCS26e2eX