It means greek letters. Obviously ;)
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Even a notion apparently so simple as "recursion" can be tricky to pin down, both because it's hard to find a general enough definition and because it's actually polysemic (this has poisoned the debate about Chomskyan syntax for decades)
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But what does it *formally* mean?
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In language studies it refers to languages invented that babies/children cannot learn naturally. I always thought that was a very useful definition. Even proper grammar is formal bc most people learn grammar naturally without any structures. Formal langs r strictly structured.
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