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Yes I think he has made a mistake there. He did get it right earlier in the article he says "This makes Cat a subtype of Animal. That means that all Cats are An
by jeremyjh 11y ago
Yes I think he has made a mistake there. He did get it right earlier in the article he says "This makes Cat a subtype of Animal. That means that all Cats are Animals, but not all Animals are Cats."
- thechao 11y agoThis is why I like the terms "derived" and "base": pretty much impossible to mix up.
- maxerickson 11y agoThe text describing the relationships between A,B,C,D makes a lot more sense to me if the example is switched to Thing -> Cat