** Mount Nyiragongo erupts in eastern Zaire ( now the Democratic Republic of the Congo ).

** Angolan Civil War ( 1975 – 2002 )-resulting in intervention by multiple countries on the Marxist and anti-Marxist sides, with Cuba and Mozambique supporting the Marxist faction while South Africa and Zaire support the anti-Marxists.

** The First Congo War takes place in Zaire from 1996 to 1997, resulting in Zairian dictator Mobutu Sese Seko being overthrown from power on 16 May 1997, ending 32 years of his rule.

** France supports the new transitional government in Zaire, withdrawing its support of Mobutu Sese Seko.

** President of Zaire Mobutu Sese Seko lifts a 20-year ban on opposition parties.

** The first known outbreak of Ebola virus occurs in Yambuku, Zaire.

** Etienne Francois, Duke of Choiseul, French statesman ( b. 1719 )

** Etienne Richard, composer, organist and harpsichordist ( born c. 1621 )

** Les Mauvaises Gens, by Etienne Davodeau, wins Grand Prix de la Critique for 2005.

** The jury selects Etienne Davodeau's Les Mauvaises Gens to receive the Prix du Public at the Angoulême International Comics Festival.

** Eunectes murinus, the green anaconda, the largest species, is found east of the Andes in Colombia, Venezuela, the Guianas, Ecuador, Peru, Bolivia, Brazil and on the island of Trinidad.

** Eunectes notaeus, the yellow anaconda, a smaller species, is found in eastern Bolivia, southern Brazil, Paraguay and northeastern Argentina.

** Eunectes deschauenseei, the dark-spotted anaconda, is a rare species found in northeastern Brazil and coastal French Guiana.

** Eunectes beniensis, the Bolivian anaconda, the most recently defined species, is found in the Departments of Beni and Pando in Bolivia.

** Tarski's theorem: For every infinite set A, there is a bijective map between the sets A and A × A.

** The Cartesian product of any family of nonempty sets is nonempty.

** König's theorem: Colloquially, the sum of a sequence of cardinals is strictly less than the product of a sequence of larger cardinals.

** Hausdorff maximal principle: In any partially ordered set, every totally ordered subset is contained in a maximal totally ordered subset.

** For every non-empty set S there is a binary operation defined on S that makes it a group.

** Tychonoff's theorem stating that every product of compact topological spaces is compact.

** In the product topology, the closure of a product of subsets is equal to the product of the closures.

** If S is a set of sentences of first-order logic and B is a consistent subset of S, then B is included in a set that is maximal among consistent subsets of S. The special case where S is the set of all first-order sentences in a given signature is weaker, equivalent to the Boolean prime ideal theorem ; see the section " Weaker forms " below.

** Any union of countably many countable sets is itself countable.

** If the set A is infinite, then there exists an injection from the natural numbers N to A ( see Dedekind infinite ).

** Every infinite game in which is a Borel subset of Baire space is determined.

** The Vitali theorem on the existence of non-measurable sets which states that there is a subset of the real numbers that is not Lebesgue measurable.

** The Lebesgue measure of a countable disjoint union of measurable sets is equal to the sum of the measures of the individual sets.

** The Nielsen – Schreier theorem, that every subgroup of a free group is free.

** Józef Piłsudski is appointed head of state of Poland.

** The Reichstag passes a statement stating that Hitler, s second-in-command Reichsmarshall Hermann Göring should be appointed as Hitler, s succesor as Führer should Hitler die in the middle of the Second World War. Rudolf Hess is to be appointed in Göring, s place should anything befall Göring.

** The British Labour Party is formed and Ramsay MacDonald is appointed as its first secretary.

** Sir Douglas Nicholls appointed 28th Governor of South Australia, the first Australian Aboriginal appointed to vice-regal office.

** William Henry Hastie becomes the first African-American appointed to a federal judgeship.

** KGB head Yuri Andropov is appointed to the Secretariat of the Communist Party of the Soviet Union.

** First Surgeon General appointed.

** Nazi leader Adolf Hitler is appointed Chancellor of Germany by President of Germany Paul von Hindenburg.

** Earl Warren is appointed Chief Justice of the United States by U. S. president Dwight D. Eisenhower.

** İsmet İnönü is appointed as the prime minister in Turkey ( Turkey's 4th and İnönü's 3rd government ).

** John Donne is appointed as Reader in Divinity at his old inn of court, Lincoln's Inn.

** October – Caesar appointed Dictator in Rome.

** Thomas Herring is appointed Archbishop of Canterbury.

** Peter Stuyvesant is appointed Director of New Amsterdam by the Dutch West India Company.

** Louis, having established two of his other daughters as abbesses of convents, appointed Irmgard ( also known as Ermengard ) to govern first the monastery of Buchau and then the royal abbey of Chiemsee in Bavaria.

** Timarchus, Seleucid nobleman, possibly from Miletus in Anatolia, appointed governor of Media in western Iran by the Seleucid king Antiochus IV Epiphanes and who has rebelled against his successor, Demetrius I Soter, until he is killed in a battle with Demetrius ' forces

** one of the Levites whom Jehoshaphat appointed to teach the law ( II Chr.

** a Levite appointed to " distribute the oblations of the Lord " ( II Chr.

** John Beyrle, son of Joseph Beyrle, appointed as United States Ambassador to the Russian Federation on May 13, 2008, confirmed July 3, 2008.

** District Court appointed five men as trustees of the Town of Buckley.

** RCMP Special Constables are appointed for specific skills, for example, aboriginal language skills.

** Outside of RCMP, special constables are not police officers but are appointed to serve certain law enforcement functions.