Thus, e.g., mostly I ignored that Erdős died 3 years after the original paper had been finished: I kept the “Present Time” even in places where today this may seem strange. Wherever I could I tried to keep the original text. …Yet, this paper does not try to cover the new developments: that would be too much. The later one includes references to some newer survey papers and some newer results. ![]() ![]() Several minor corrections, new remarks, and a new section of References are added. This paper is a somewhat revised version of an old survey paper of mine.
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