** 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.

** Well-ordering theorem: Every set can be well-ordered.

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

** Trichotomy: If two sets are given, then either they have the same cardinality, or one has a smaller cardinality than the other.

** 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.

** Every surjective function has a right inverse.

** Zorn's lemma: Every non-empty partially ordered set in which every chain ( i. e. totally ordered subset ) has an upper bound contains at least one maximal element.

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

** Tukey's lemma: Every non-empty collection of finite character has a maximal element with respect to inclusion.

** Antichain principle: Every partially ordered set has a maximal antichain.

** Every vector space has a basis.

** Every unital ring other than the trivial ring contains a maximal ideal.

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

** The closed unit ball of the dual of a normed vector space over the reals has an extreme point.

** 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.

** Nine of his centuries are double centuries ( surpassed only by Donald Bradman )

** Two of them are triple-centuries ( matched by Australia's Donald Bradman, India's Virender Sehwag, and West Indies ' Chris Gayle ).

** Donald Maclean, Acting Leader 1919 – 1920

** Donald of Ogilvy

** Luke Donald, English golfer

** Donald Regan, American Treasury Secretary and White House Chief of Staff ( d. 2003 )

** Donald Blakeslee, American aviator ( d. 2008 )

** James Donald, Scottish actor ( b. 1917 )

** Donald Bradman, Australian cricketer ( d. 2001 )

** Donald A. Glaser, American physicist, Nobel Prize laureate

** Donald Fagen, American rock keyboardist

** Neale Donald Walsch, American author of the popular books Conversations with God

** Donald Braswell II, American singer

** Donald Crisp, English actor ( b. 1882 )

** Donald Neilson, British serial killer known as the Black Panther

** Donald Hall, American poet and U. S. Poet Laureate

** Donald Dewar, First Minister of Scotland ( d. 2000 )

** Donald B. Beary, American admiral ( d. 1966 )

** An anti-war rally is held at Valley Forge, Pennsylvania, attended by John Kerry, Jane Fonda and Donald Sutherland.

** Donald Sangster becomes the new Prime Minister of Jamaica, succeeding Alexander Bustamante.

** Donald Campbell, English water and land speed record seeker ( b. 1921 )

** Indianapolis 500: In what Indianapolis Motor Speedway historian Donald Davidson and Speedway public address announcer Tom Carnegie later call the greatest moment in the track's history, 1973 winner Gordon Johncock wins his second race over 1979 winner Rick Mears by 0. 16 seconds, the closest finish to that date, after Mears draws alongside Johncock with a lap remaining, after erasing a seemingly insurmountable advantage of more than 11 seconds in the final 10 laps.

** Donald Wills Douglas, American industrialist ( d. 1981 )

** Donald Voorhees, American composer and musician ( b. 1903 )

** Donald Barthelme, American writer ( b. 1931 )