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  2. Economic history of Spain - Wikipedia

    en.wikipedia.org/wiki/Economic_history_of_Spain

    The principal lubricants of the economic expansion, however, were the hard currency remittances of one million Spanish workers abroad, which are estimated to have offset 17.9% of the total trade deficit from 1962 to 1971; the gigantic increase in tourism that drew more than 20 million visitors per year by the end of the 1960s, accounting by ...

  3. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    As an illustration of this, the parity cycle (1 1 0 0 1 1 0 0) and its sub-cycle (1 1 0 0) are associated to the same fraction ⁠ 5 / 7 ⁠ when reduced to lowest terms. In this context, assuming the validity of the Collatz conjecture implies that (1 0) and (0 1) are the only parity cycles generated by positive whole numbers (1 and 2 ...

  4. 1,000,000,000 - Wikipedia

    en.wikipedia.org/wiki/1,000,000,000

    With a number, "billion" can be abbreviated as b, bil [citation needed] or bn. [2] [3] In standard form, it is written as 1 × 10 9. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is G. One billion years may be called an eon in astronomy or geology.

  5. Division by zero - Wikipedia

    en.wikipedia.org/wiki/Division_by_zero

    The reciprocal function y = ⁠ 1 / x ⁠. As x approaches zero from the right, y tends to positive infinity. As x approaches zero from the left, y tends to negative infinity. In mathematics, division by zero, division where the divisor (denominator) is zero, is a unique and problematic special case.

  6. Demographics of the world - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_the_world

    Demographics of the world. Demographics of Earth. Population pyramid of the world in 2022 by the UN. Population. Over 8,120,531,329 (estimated) Fertility rate. 2.27 (2021) Earth has a human population of over 8 billion as of 2024, with an overall population density of 50 people per km 2 (130 per sq. mile). Nearly 60% of the world's population ...

  7. Division by infinity - Wikipedia

    en.wikipedia.org/wiki/Division_by_infinity

    The hyperbola = /.As approaches ∞, approaches 0.. In mathematics, division by infinity is division where the divisor (denominator) is ∞.In ordinary arithmetic, this does not have a well-defined meaning, since ∞ is a mathematical concept that does not correspond to a specific number, and moreover, there is no nonzero real number that, when added to itself an infinite number of times ...

  8. Economy of Spain - Wikipedia

    en.wikipedia.org/wiki/Economy_of_Spain

    It is the world's 15th largest by nominal GDP and the sixth-largest in Europe. Spain is a member of the European Union and the eurozone, as well as the Organization for Economic Co-operation and Development and the World Trade Organization. In 2023, Spain was the 18th-largest exporter in the world. Meanwhile in 2022, Spain was the 15th-largest ...

  9. Demographics of Spain - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_Spain

    As of 2024, there were 8,915,831 foreign-born people in Spain, making up to 18.31% of the Spanish population [41] Of these, 6,581,028 (13.51%) didn't have Spanish citizenship. [ 42 ] [ 43 ] This makes Spain one of the world's preferred destinations to immigrate to , being the 4th country in Europe by immigration numbers and the 10th worldwide.