** The government of Mozambique signs a truce with leaders of RENAMO, ending the 16-year-old Mozambican Civil War.

** U. S. Lieutenant Colonel William R. Higgins, serving with a United Nations group monitoring a truce in southern Lebanon, is kidnapped ( he is later killed by his captors ).

** The OAS signs a truce with the FLN in Algeria, but a day later announces that it will continue the fight on behalf of French Algerians.

** The Irish War of Independence comes to an end when a truce is signed between the British Government and Irish forces.

** A truce is declared in the Democratic Republic of the Congo.

** Cut-throat: Three players, in this game after a player wins the bet and calls the Trump, the other two players form a temporary unspoken truce to try to ' Shoot ' the bidder.

** 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.

** Croatian War of Independence ( 1991 – 1995 ) – the war fought in hegh town Croatia between the Croatian government, having declared independence from the Socialist Federal Republic of Yugoslavia, and both the Yugoslav People's Army ( JNA ) and Serb forces, who established the self-proclaimed Republic of Serbian Krajina ( RSK ) within Croatia.

** 1948 Arab – Israeli War ( 1948 – 1949 ) – The war was fought between the newly declared State of Israel and its Arab neighbours.

** A new Polish government is declared in Western Galicia ( Central Europe ).

** The Hungarian Democratic Republic is declared.

** The Ukraine is declared a republic.

** Eritrea: Eritrean independence was declared as a result of a referendum held with UN verification.

** Martial law is declared in Britain because of the general strike.

** Martial law is declared in Madrid, the University is closed and over 300 students are arrested.

** The Socialist Federal Republic of Yugoslavia is declared ( this day is celebrated as Republic Day until the 1990s ).

** A state of emergency is declared in Malaya and the Straits Settlements.

** An armistice is declared between Austria and others.

** Kuala Lumpur, the capital of Malaysia, was declared as a Federal Territory.

** A second republic is declared in the Maldives.

** East Timor is declared the 27th province of Indonesia.

** In India, May 1 is declared as ' Maharashtra Divas ', i. e., Maharashtra Day ( also celebrated as ' Kaamgaar Divas ', i. e., Workers Day ).

** Cameroon declared independence from United Kingdom.

** A curfew is declared in Jakarta, Indonesia.

** East Pakistan ( now Bangladesh ) independence is declared by local Awami League leader Hannan Sarker on behalf of Sheikh Mujibur Rahman, from Kalurghat Radio Station in Chittagong.

** A " Turkish Federated State of North Cyprus " is declared as an unsuccessful first step to international recognition of a Turkish Cypriot separatist state in Cyprus.

** Braniff International Airways is declared bankrupt and ceases all flights.

** Christmas is declared a federal holiday in the United States.

** Andrés Rodríguez, who had seized power and declared himself President of Paraguay during a military coup in February, wins a landslide election in a general election marked by charges of fraud.

** The Hungarian Republic is officially declared by president Mátyás Szűrös ( replacing the Hungarian People's Republic ).