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  1. en.wikipedia.org › wiki › Golden_ratioGolden ratio - Wikipedia

    5 天前 · The golden ratio's negative −φ and reciprocal φ−1 are the two roots of the quadratic polynomial x2 + x − 1. The golden ratio is also an algebraic number and even an algebraic integer. It has minimal polynomial. This quadratic polynomial has two roots, and. The golden ratio is also closely related to the polynomial.

  2. 4 天前 · Canada, a country with a comparatively low suicide rate overall at 10.3 incidents per 100,000 people, exhibits one such discrepancy. When comparing the suicide rate of Indigenous peoples in Canada, the rate of suicide increases to 24.3 incidents per 100,000 people: [19] a rate among the ten highest in the world.

  3. en.wikipedia.org › wiki › PiPi - Wikipedia

    6 天前 · The number π (/paɪ/; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although ...

  4. 3 天前 · 2024 list by the United Nations Population Fund Rank Country Total Fertility rate in 2024 (births/woman) 1 Niger 6.6 2 Chad 6.0 3 DR Congo 6.0 4 Somalia 6.0 5 Central African Republic 5.7 6 Mali 5.7 7 Angola 5.0 8 Nigeria 5.0 9 Burundi 4.8 10 Benin 4.7 11 Burkina Faso

  5. 2 天前 · The same viaduct completed in February 2021. California High-Speed Rail ( CAHSR) is a publicly funded high-speed rail system being developed in California by the California High-Speed Rail Authority. Phase 1, about 494 miles (795 km) long, is planned to run from San Francisco to Los Angeles and Anaheim via the Central Valley, and is partially ...

  6. 1 天前 · Principal component analysis ( PCA) is a linear dimensionality reduction technique with applications in exploratory data analysis, visualization and data preprocessing . The data is linearly transformed onto a new coordinate system such that the directions (principal components) capturing the largest variation in the data can be easily identified.

  7. 4 天前 · Young's modulus is defined as the ratio of the stress (force per unit area) applied to the object and the resulting axial strain (displacement or deformation) in the linear elastic region of the material. Although Young's modulus is named after the 19th-century British scientist Thomas Young, the concept was developed in 1727 by Leonhard Euler.