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2. Natural number - Wikipedia

   en.wikipedia.org/wiki/Natural_number

   Addition and multiplication are compatible, which is expressed in the distribution law: a × (b + c) = (a × b) + (a × c). These properties of addition and multiplication make the natural numbers an instance of a commutative semiring. Semirings are an algebraic generalization of the natural numbers where multiplication is not necessarily ...

3. Calculus - Wikipedia

   en.wikipedia.org/wiki/Calculus

   For example, traveling a steady 50 mph for 3 hours results in a total distance of 150 miles. Plotting the velocity as a function of time yields a rectangle with a height equal to the velocity and a width equal to the time elapsed. Therefore, the product of velocity and time also calculates the rectangular area under the (constant) velocity curve.

4. Germany - Wikipedia

   en.wikipedia.org/wiki/Germany

   Germany, [e] officially the Federal Republic of Germany, [f] is a country in Central Europe.It lies between the Baltic and North Sea to the north and the Alps to the south. Its sixteen constituent states have a total population of over 82 million in an area of 357,596 km 2 (138,069 sq mi), making it the most populous member state of the European Union.

5. List of countries by GDP sector composition - Wikipedia

   en.wikipedia.org/wiki/List_of_countries_by_GDP...

   Toggle the table of contents. List of countries by GDP sector composition. 9 languages. ... 46: 2.1.. 26.5: 17.2: 0.2

6. History of mathematics - Wikipedia

   en.wikipedia.org/wiki/History_of_mathematics

   The treatise also provides values of π, [106] which Chinese mathematicians originally approximated as 3 until Liu Xin (d. 23 AD) provided a figure of 3.1457 and subsequently Zhang Heng (78–139) approximated pi as 3.1724, [113] as well as 3.162 by taking the square root of 10.

7. Golden ratio - Wikipedia

   en.wikipedia.org/wiki/Golden_ratio

   Exceptionally, the golden ratio is equal to the limit of the ratios of successive terms in the Fibonacci sequence and sequence of Lucas numbers: [42] + = + =. In other words, if a Fibonacci and Lucas number is divided by its immediate predecessor in the sequence, the quotient approximates ⁠ φ {\displaystyle \varphi } ⁠ .

8. Academic term - Wikipedia

   en.wikipedia.org/wiki/Academic_term

   In Kenya, for K-12 education, the calendar year starts in January and ends in November. The academic year is divided into 3 terms as follows: Term 1: Early January – Late March; Term 2: Early May – Late July; Term 3: Early September – Early/Mid November; April, August and December are usually school holidays.

9. Eugenics - Wikipedia

   en.wikipedia.org/wiki/Eugenics

   A 1930s exhibit by the Eugenics Society.Some of the signs read "Healthy and Unhealthy Families", "Heredity as the Basis of Efficiency" and "Marry Wisely".Eugenics (/ j uː ˈ dʒ ɛ n ɪ k s / yoo-JEN-iks; from Ancient Greek εύ̃ (eû) 'good, well' and -γενής (genḗs) 'born, come into being, growing/grown') [1] is a set of beliefs and practices that aim to improve the genetic quality ...