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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.
[11] The area of a Pythagorean triangle cannot be the square [12]: p. 17 or twice the square [12]: p. 21 of an integer. Exactly one of a, b is divisible by 2 (is even), and the hypotenuse c is always odd. [13] Exactly one of a, b is divisible by 3, but never c. [14] [8]: 23–25
The government's economic policies, shaped by the desire to attract foreign capital is criticised by some for causing a deterioration in the economic condition of the working class, which potentially leads to a cycle of reduced aggregate demand, further hurting the economy and making it subservient to the interests of foreign capital at the ...
Python is a high-level, general-purpose programming language.Its design philosophy emphasizes code readability with the use of significant indentation. [33]Python is dynamically type-checked and garbage-collected.
Alice's Adventures in Wonderland was conceived on 4 July 1862, when Lewis Carroll and Reverend Robinson Duckworth rowed up the river Isis with the three young daughters of Carroll's friend Henry Liddell: [8] [9] Lorina Charlotte (aged 13; "Prima" in the book's prefatory verse); Alice Pleasance (aged 10; "Secunda" in the verse); and Edith Mary (aged 8; "Tertia" in the verse).
Given that the problem of high textbook prices is linked to the "broken" economics of the market, requiring publishers to disclose textbook prices to faculty is a solution pursued by a number of legislatures. [23] By inserting price into sales interactions, this regulation will supposedly make the economic forces operate more normally.
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] thermionic valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
Postpartum depression (PPD), also called perinatal depression, is a mood disorder which may be experienced by pregnant or postpartum individuals. [3] Symptoms include extreme sadness, low energy, anxiety, crying episodes, irritability, and changes in sleeping or eating patterns. [1]