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  2. Timeline of algebra - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_algebra

    The following is a timeline of key developments of algebra : Year. Event. c. 1800 BC. An Old Babylonian tablet (Strasbourg 363) seeks the solution of a quadratic equation. [ 1] c. 1800 BC. The Plimpton 322 tablet gives a table of Pythagorean triples in Babylonian Cuneiform script. [ 2]

  3. History of algebra - Wikipedia

    en.wikipedia.org/wiki/History_of_algebra

    Etymology. The word "algebra" is derived from the Arabic word الجبر al-jabr, and this comes from the treatise written in the year 830 by the medieval Persian mathematician, Al-Khwārizmī, whose Arabic title, Kitāb al-muḫtaṣar fī ḥisāb al-ğabr wa-l-muqābala, can be translated as The Compendious Book on Calculation by Completion ...

  4. Celtic calendar - Wikipedia

    en.wikipedia.org/wiki/Celtic_calendar

    The calendar uses a mathematical arrangement to keep a normal 12 month calendar in sync with the moon and keeps the whole system in sync by adding an intercalary month every 2 + 1 ⁄ 2 years. The Coligny calendar registers a five-year cycle of 62 lunar months , divided into a "bright" and a "dark" fortnight (or half a moon cycle) each.

  5. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    The first calendar allegedly dates back to 8th century BC during the Roman Kingdom and included 356 days plus a leap year every other year. [98] In contrast, the lunar calendar of the Republican era contained 355 days, roughly ten-and-one-fourth days shorter than the solar year , a discrepancy that was solved by adding an extra month into the ...

  6. Elements of Algebra - Wikipedia

    en.wikipedia.org/wiki/Elements_of_Algebra

    The title page of Elements of Algebra. Elements of Algebra is an elementary mathematics textbook written by mathematician Leonhard Euler around 1765 in German. It was first published in Russian as "Universal Arithmetic" (Универсальная арифметика), two volumes appearing in 1768-9 and in 1770 was printed from the original text.

  7. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The calendar has 13 months in a year (afo), 7 weeks in a month (onwa), and 4 days of Igbo market days (afor, nkwo, eke, and orie) in a week (izu) plus an extra day at the end of the year, in the last month. The name of these months was reported by Onwuejeogwu (1981). The Yoruba calendar is a calendar used by the Yoruba people of southwestern ...

  8. Outline of algebra - Wikipedia

    en.wikipedia.org/wiki/Outline_of_algebra

    Algebra is one of the main branches of mathematics, covering the study of structure, relation and quantity. Algebra studies the effects of adding and multiplying numbers, variables, and polynomials, along with their factorization and determining their roots. In addition to working directly with numbers, algebra also covers symbols, variables ...

  9. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Solar calendar with 13 months of 28 days. Badí‘ calendar: solar: Baháʼí: 1873: Baháʼí: Uses a year of 19 months of 19 days each and a 1844 era. Also known as the "Baháʼí Calendar" or the "Wondrous Calendar". Thai solar calendar: solar: Gregorian: 1888: Thailand: The Gregorian calendar but using the Buddhist Era (543 BC) Invariable ...

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