A group, in mathematics, is a set together with an operation that
combines any two of its elements to form a third element, in such a way
that the operation is associative, an identity element exists, and every
element has an inverse. These three conditions, called group axioms,
are familiar from number systems. The ubiquity of groups in numerous
areas—both within and outside mathematics—makes them a central
organizational tool in contemporary mathematics. The concept of a group
arose from the study of polynomial equations, starting with Évariste
Galois in the 1830s. After contributions from other fields such as
number theory and geometry, the group notion was generalized and firmly
established around 1870. Today, group theory is a very active
mathematical discipline that studies groups in their own right. Symmetry
groups are widely applied in molecular chemistry and various physical
disciplines.
Read more: <https://en.wikipedia.org/wiki/Group_%28mathematics%29>
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Today's selected anniversaries:
1489:
Catherine Cornaro, Queen of Cyprus, was forced to abdicate and
sell the administration of the island to the Republic of Venice.
<https://en.wikipedia.org/wiki/Catherine_Cornaro>
1885:
The Mikado, Gilbert and Sullivan's most frequently performed
Savoy opera, debuted at the Savoy Theatre in London.
<https://en.wikipedia.org/wiki/The_Mikado>
1969:
Edward M. Burke, the longest-serving alderman in the history of
the Chicago City Council, was sworn into office.
<https://en.wikipedia.org/wiki/Edward_M._Burke>
1984:
Gerry Adams, leader of Sinn Féin, was seriously wounded in an
assassination attempt by Ulster Freedom Fighters in central Belfast,
Northern Ireland.
<https://en.wikipedia.org/wiki/Gerry_Adams>
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Wiktionary's word of the day:
Pi Day:
March 14th, an annual celebration of the mathematical constant π (pi).
<https://en.wiktionary.org/wiki/Pi_Day>
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Wikiquote quote of the day:
With an aching heart I add my voice to that of the common people,
who implore the end of the war. In the name of God, listen to the cry of
those who suffer, and put an end to the bombings and the attacks! The
city that bears the name of the Virgin Mary, Mariupol, has become a city
martyred by the ruinous war that is devastating Ukraine. Before the
barbarism of killing children and innocent and defenceless citizens, no
strategic reasons hold: the only thing to be done is to cease the
unacceptable armed aggression before cities are reduced to cemeteries.
--Pope Francis
<https://en.wikiquote.org/wiki/Pope_Francis>
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