5:5
May 5th
Approx. midpoint of Spring.
Loud and Clear.
In math;
To give a name to a map, e.g., f:x|->x^2 (which is equivalent to the function notation f(x)=x^2).
A map is a way of associating unique objects to every element in a given set. So a map f:A|->B from A to B is a function f such that for every a in A, there is a unique object f(a) in B. The terms function and mapping are synonymous for map.
https://en.wikipedia.org/wiki/May_5
(some highlights)
In history;
1215 – Rebel barons renounce their allegiance to King John of England — part of a chain of events leading to the signing of the Magna Carta.
1494 – Christopher Columbus lands on the island of Jamaica and claims it for Spain.
1762 – Russia and Prussia sign the Treaty of St. Petersburg.
1862 – Cinco de Mayo: Troops led by Ignacio Zaragoza halt a French invasion in the Battle of Puebla in Mexico.
1864 – American Civil War: The Battle of the Wilderness begins in Spotsylvania County.
1865 – American Civil War: The Confederate government was declared dissolved at Washington, Georgia.
1866 – Memorial Day first celebrated in United States at Waterloo, New York.
1905 – The trial in the Stratton Brothers case begins in London, England; it marks the first time that fingerprint evidence is used to gain a conviction for murder.
1912 – Pravda, the "voice" of the Communist Party of the Soviet Union, begins publication in Saint Petersburg.
1941 – Emperor Haile Selassie returns to Addis Ababa; the country commemorates the date as Liberation Day or Patriots' Victory Day.
1946 – The International Military Tribunal for the Far East begins in Tokyo with twenty-eight Japanese military and government officials accused of war crimes and crimes against humanity.
1980 – Operation Nimrod: The British Special Air Service storms the Iranian embassy in London after a six-day siege.
1987 – Iran–Contra affair: Start of Congressional televised hearings in the United States of America.
Births;
1818 – Karl Marx
1919 – Georgios Papadopoulos
Holidays;
Children's Day (Japan, South Korea)
Christian feast day:
Angelus of Jerusalem
Aventinus of Tours
Blessed Edmund Ignatius Rice
Frederick the Wise (Lutheran Church–Missouri Synod)
Hilary of Arles
Jutta of Kulmsee
Stanisław Kazimierczyk
May 5 (Eastern Orthodox liturgics)
Cinco de Mayo (Mexico, United States)
Constitution Day (Kyrgyzstan)
Europe Day (Council of Europe)
Feast of al-Khadr or Saint George (Palestinian)
Indian Arrival Day (Guyana)
International Midwives' Day (International)
Liberation Day (Denmark, Netherlands)
Lusophone Culture Day (Community of Portuguese Language Countries)
Martyrs' Day (Albania)
Patriots' Victory Day (Ethiopia)
Senior Citizens Day (Palau)
Tango no sekku (Japan)