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Indra, я ведь тоже не лингвист, что такое нулевой артикль?

It's simple. The "a" AFAIK came from "one" - in Russian the word "one" - "один" is often used the same way: "один мужик" - a man, "один случай" - a case, "один мой друг" - a friend of mine. The "the"...