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Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.
If the number of digits is even, add the first and subtract the last digit from the rest. The result must be divisible by 11. 918,082: the number of digits is even (6) → 1808 + 9 − 2 = 1815: 81 + 1 − 5 = 77 = 7 × 11. If the number of digits is odd, subtract the first and last digit from the rest. The result must be divisible by 11.
Round: Nickel-plated steel: 2.62 g: 18 mm: Reeded: Denomination of the coin, the eight stars and waves representing the patterns of the national flag: Coat of arms of Venezuela and the name of the country of emission: 12 + 1 ⁄ 2 céntimos: Round: Nickel-plated steel: 3.93 g: 23 mm: Plain: Denomination of the coin, the eight stars of the ...
These numbers also give the solution to certain enumerative problems, [68] the most common of which is that of counting the number of ways of writing a given number n as an ordered sum of 1s and 2s (called compositions); there are F n+1 ways to do this (equivalently, it's also the number of domino tilings of the rectangle).
The number of dwarf planets even among known objects is not certain. In 2019, Grundy et al. argued based on the low densities of some mid-sized trans-Neptunian objects that the limiting size required for a trans-Neptunian object to reach equilibrium was in fact much larger than it is for the icy moons of the giant planets, being about 900 ...
Alexandria has a number of higher education institutions. Alexandria University is a public university that follows the Egyptian system of higher education. Many of its faculties are internationally renowned, most notably its Faculty of Medicine & Faculty of Engineering.
Michael Wayne Haley was arrested for stealing a calculator from Walmart in 1997. [65] Because of Haley's previous criminal convictions, he was sentenced to 16 + 1 ⁄ 2 years in prison under the Texas habitual offender law. After Haley had exhausted his appeals, it became known that Haley's robbery offense occurred three days before one of his ...