** 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.

** Horizontal: 400 or 408 scan lines per inch

** 6 × 0. 50 in ( 12. 7 mm ) AN / M2 Browning machine guns, 400 rpg or

** Data stored in the instruction, e. g. "# 400 "

** RPG-22 " Netto ( Nett )": One-shot disposable RPG launcher, PG-22 with ~ 400 mm RHA penetration

** Infrared-A: 700 nm to 1, 400 nm

** Infrared-B: 1, 400 nm to 3, 000 nm

** Some 400 – 1, 000 students march through Times Square, New York and another 700 in San Francisco, in the first major student demonstration against the Vietnam War.

** Sri Lankan civil war – Battle of Pooneryn: Over 400 Sri Lankan military are killed.

** The paddlewheel steamer sinks off the Georgia coast, with a cargo of $ 400, 000 in coins.

** The Wilhelm Gustloff, with over 10, 000 mainly civilian Germans from Gotenhafen ( Gdynia ) in the Gdansk Bay, is sunk by three torpedoes from the Soviet submarine S-13 in the Baltic Sea ; up to 9, 400 are thought to have died – the greatest loss of life in a single ship sinking in war action in history.

** French Resistance Coup in Algiers: 400 French civil resistants neutralize the Vichyist XIXth Army Corps and the Vichyist generals ( Juin, Darlan, etc.

** At least 1, 400 people are killed in an earthquake measuring 7. 4 on the Richter Scale, in the Ancash Region and Quiches District in Peru.

** Central Bank bombing: an explosives-filled truck rams into the gates of the Central Bank in Colombo, Sri Lanka, killing at least 86 and injuring 1, 400.

** An explosion in Shaoyang, China kills 122 and injures over 400 when 10 tons of dynamite in an illegal explosives warehouse underneath an apartment building detonate.

** The Vietnam War officially begins, as the first American helicopters arrive in Saigon along with 400 U. S. personnel.

** Portuguese surrender Goa to India after 400 years of Portuguese rule.

** The Big Thompson River in northern Colorado floods, destroying more than 400 cars and houses and killing 143 people.

** The Portuguese army kills 400 Africans in Tete, Mozambique.

** A huge gas explosion at a subway construction site in Osaka, Japan kills 79 and injures over 400.

** Vietnam War: The Pentagon tells U. S. President Lyndon B. Johnson that if planned major sweep operations to neutralize Viet Cong forces during the next year are to succeed, the number of American troops in Vietnam will have to be increased from 120, 000 to 400, 000.

** Watergate scandal: In Orlando, Florida, U. S. President Richard Nixon tells 400 Associated Press managing editors " I am not a crook.

** A blowout at the Ixtoc I oil well in the southern Gulf of Mexico causes at least 600, 000 tons ( 176, 400, 000 gallons ) of oil to be spilled into the waters, the worst oil spill to date.

** Payload to Low Earth Orbit 24, 400 kg ( 53, 700 lb )

** Renaissance Center Tower 400, 1973 – 1977

** Northpark 400, 1986