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  2. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    Any real number can be written in the form m × 10 ^ n in many ways: for example, 350 can be written as 3.5 × 10 2 or 35 × 10 1 or 350 × 10 0. In normalized scientific notation (called "standard form" in the United Kingdom), the exponent n is chosen so that the absolute value of m remains at least one but less than ten (1 ≤ | m | < 10).

  3. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    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.

  4. Propositional calculus - Wikipedia

    en.wikipedia.org/wiki/Propositional_calculus

    The propositional calculus [a] is a branch of logic. [1] It is also called propositional logic, [2] statement logic, [1] sentential calculus, [3] sentential logic, [4] [1] or sometimes zeroth-order logic. [b] [6] [7] [8] Sometimes, it is called first-order propositional logic [9] to contrast it with System F, but it should not be confused with ...

  5. Pythagoras - Wikipedia

    en.wikipedia.org/wiki/Pythagoras

    Pythagoras of Samos [a] (Ancient Greek: Πυθαγόρας; c. 570 – c. 495 BC) [b] was an ancient Ionian Greek philosopher, polymath, and the eponymous founder of Pythagoreanism.

  6. Pakistan - Wikipedia

    en.wikipedia.org/wiki/Pakistan

    It is a declared nuclear-weapons state, and is ranked amongst the emerging and growth-leading economies, [18] with a large and rapidly growing middle class. [ 19 ] [ 20 ] Pakistan's political history since independence has been characterized by periods of significant economic and military growth as well as those of political and economic ...

  7. History of science - Wikipedia

    en.wikipedia.org/wiki/History_of_science

    The first 12 chapters of the Siddhanta Shiromani, written by Bhāskara in the 12th century, cover topics such as: mean longitudes of the planets; true longitudes of the planets; the three problems of diurnal rotation; syzygies; lunar eclipses; solar eclipses; latitudes of the planets; risings and settings; the moon's crescent; conjunctions of ...

  8. Greek language - Wikipedia

    en.wikipedia.org/wiki/Greek_language

    Greek has been spoken in the Balkan peninsula since around the 3rd millennium BC, [18] or possibly earlier. [19] The earliest written evidence is a Linear B clay tablet found in Messenia that dates to between 1450 and 1350 BC, [20] making Greek the world's oldest recorded living language. [21]

  9. Soviet Union - Wikipedia

    en.wikipedia.org/wiki/Soviet_Union

    The Union of Soviet Socialist Republics [r] (USSR), [s] commonly known as the Soviet Union, [t] was a transcontinental country that spanned much of Eurasia from 1922 to 1991. . During its existence, it was the largest country by area, extending across eleven time zones and sharing borders with twelve countries, and the third-most populous co