** Václav Havel resigns as president of Czechoslovakia.

** Václav Talich, Czech conductor

** James Mallinson ( producer ), Charles Mackerras ( conductor ), Jiri Zahradnicek, Ivo Žídek, Václav Zítek & the Vienna Philharmonic Orchestra for Janáček: From the House of the Dead

** James Mallinson ( producer ), Charles Mackerras ( conductor ), Jiri Zahradnicek, Ivo Žídek, Václav Zítek & the Vienna Philharmonic Orchestra for Janáček: From the House of the Dead

** David Cory, Amr Fahmy and Timothy Havel, and at the same time Neil Gershenfeld and Isaac L. Chuang at MIT published the first papers realising gates for quantum computers based on bulk spin resonance, or thermal ensembles.

** Documents are exhibited in the cathedral museum in the town of Brandenburg an der Havel.

** 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.

** Vicente Fox is elected President of Mexico, as candidate of the rightist PAN ( National Action Party ), ending 71 years of PRI ( Institutional Revolutionary Party ) rule.

** Hillary Rodham Clinton is elected to the United States Senate, becoming the first First Lady of the United States to win public office.

** San Francisco elects City Supervisor Harvey Milk, the first openly gay elected official of any large city in the U. S.

** Dr. Kwame Nkrumah is elected Prime Minister of the Gold Coast.

** Mahamane Ousmane is elected president of Niger.

** Chilean presidential election, 1993: Eduardo Frei Ruiz-Tagle is elected with 58 % of the vote.

** Niceto Alcalá-Zamora is elected president of the Spanish Republic.

** In Sweden, Olof Palme is elected Labour Party leader, replacing Tage Erlander as prime minister on October 14.

** General Eurico Gaspar Dutra is elected president of Brazil.

** António Óscar Carmona is elected president of Portugal.

** Ho Chi Minh is elected President of North Vietnam.

** Nehru is elected leader of the Congress Party in India.

** The Sandinistas are defeated in the Nicaraguan elections, with Violeta Chamorro elected as the new president of Nicaragua, replacing Daniel Ortega.

** Patricio Aylwin is sworn in as the first democratically elected Chilean president since 1970.

** Mikhail Gorbachev is elected as the first executive president of the Soviet Union.

** Fernando Collor de Mello takes office as President of Brazil, Brazil's first democratically elected president since 1961.

** In the Colombian presidential election, César Gaviria is elected President of Colombia ; he takes office on August 7.

** Boris Yeltsin is elected as the first ever elected president of the Russian Soviet Federative Socialist Republic.

** Alberto Fujimori is elected President of Peru ; he takes office on July 28.

** Costas Simitis is elected President of the Panhellenic Socialist Movement of Greece.

** Emil Constantinescu is elected president of Romania.

** In Panama, a military coup d ' état, led by Col. Boris Martinez and Col. Omar Torrijos, overthrows the democratically elected ( but highly controversial ) government of President Arnulfo Arias.

** Luis A. Ferre is elected Governor of Puerto Rico.

** Jacques Chirac is elected president of France