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In Zermelo–Fraenkel (ZF) set theory, the natural numbers are defined recursively by letting 0 = {} be the empty set and n + 1 (the successor function) = n ∪ {n} for each n. In this way n = {0, 1, …, n − 1} for each natural number n. This definition has the property that n is a set with n elements.
Catatumbo lightning occurs over and around Lake Maracaibo. Catatumbo lightning usually develops between and , toward the west The storms are thought to be the result of winds blowing across the lake and the surrounding swampy plains.
The Fritzl case was a case that emerged in 2008, when a woman named Elisabeth Fritzl (born 6 April 1966) informed investigators in the city of Amstetten, Lower Austria, that she had been held captive for 24 years by her father, Josef Fritzl (born 9 April 1935).
Buenos Aires is based on a rectangular grid pattern, save for natural barriers or the relatively rare developments explicitly designed otherwise (most notably, the Parque Chas neighborhood). The rectangular grid provides for 110-meter (361 ft)-long square blocks named manzanas .
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