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  2. List of inequalities - Wikipedia

    en.wikipedia.org/wiki/List_of_inequalities

    1.4 Geometry. 1.5 Information theory. ... Littlewood's 4/3 inequality; ... the statement that the least-squares estimators in certain linear models are the best ...

  3. List of triangle inequalities - Wikipedia

    en.wikipedia.org/wiki/List_of_triangle_inequalities

    The parameters most commonly appearing in triangle inequalities are: the side lengths a, b, and c;; the semiperimeter s = (a + b + c) / 2 (half the perimeter p);; the angle measures A, B, and C of the angles of the vertices opposite the respective sides a, b, and c (with the vertices denoted with the same symbols as their angle measures);

  4. Triangle inequality - Wikipedia

    en.wikipedia.org/wiki/Triangle_inequality

    The first of these quadratic inequalities requires r to range in the region beyond the value of the positive root of the quadratic equation r 2 + r − 1 = 0, i.e. r > φ − 1 where φ is the golden ratio. The second quadratic inequality requires r to range between 0 and the positive root of the quadratic equation r 2 − r − 1 = 0, i.e. 0 ...

  5. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    This is approximately ⁠ 1 / 8 ⁠ inch per mile; 12.7 kilometres is exactly 500,000 standard inches and exactly 499,999 survey inches. This difference is substantial when doing calculations in State Plane Coordinate Systems with coordinate values in the hundreds of thousands or millions of feet.

  6. Unequal leg length - Wikipedia

    en.wikipedia.org/wiki/Unequal_leg_length

    Unequal leg length with a small degree of difference is very common; small inequalities in leg length may affect 40%–70% of the human population. It has been estimated that at least 0.1% of the population have a difference greater than 20 mm (0.79 in).

  7. Erdős–Mordell inequality - Wikipedia

    en.wikipedia.org/wiki/Erdős–Mordell_inequality

    The right side is the area of triangle ABC, but on the left side, r + z is at least the height of the triangle; consequently, the left side cannot be smaller than the right side. Now reflect P on the angle bisector at C. We find that cr ≥ ay + bx for P's reflection. Similarly, bq ≥ az + cx and ap ≥ bz + cy. We solve these inequalities for ...

  8. Teenager accused in Wisconsin school shooting had a ...

    www.aol.com/teenager-accused-wisconsin-school...

    The turmoil in Natalie Rupnow's family life, as documented by court records, offer a glimpse into events that may have shaped her path before Monday's tragedy.

  9. Ptolemy's inequality - Wikipedia

    en.wikipedia.org/wiki/Ptolemy's_inequality

    For four points in order around a circle, Ptolemy's inequality becomes an equality, known as Ptolemy's theorem: ¯ ¯ + ¯ ¯ = ¯ ¯. In the inversion-based proof of Ptolemy's inequality, transforming four co-circular points by an inversion centered at one of them causes the other three to become collinear, so the triangle equality for these three points (from which Ptolemy's inequality may ...