** San Luis, Ancash, capital of Carlos Fermín Fitzcarrald Province in Ancash Region

** San Fermín around 7 July in Pamplona

** Fermín Cacho Ruiz ( contemporary ), Spanish athlete, 1992 Olympics medalist

** The National Assembly of Venezuela designates Ramón José Velásquez as successor of suspended President Carlos Andrés Pérez.

** Boutros Boutros-Ghali of Egypt replaces Javier Pérez de Cuéllar of Peru as United Nations Secretary-General.

** Carlos Andrés Pérez takes office as President of Venezuela.

** Edward Pérez, Greg García, ( engineers ), Freddie Martínez, Hugo Guerrero ( engineers & producers ) & The Legends for ¿ Qué Es Música Tejana?

** Juan Pérez de Montalbán, dramatist and poet ( died 1638 )

** Raúl Pérez outpoints Wilfredo Vázquez to win a 10 round decision.

** Fernán Pérez de Guzmán, Spanish historian and poet ( died 1458 )

** John Pérez ( Assembly Speaker )

** March 23: Assassination of Javier Pérez Arenaza, alleged ETA leader, in Biarritz.

** June 15: Assassination of Tomás Pérez Revilla, alleged ETA member, by a bomb hidden in a motorcycle in Biarritz.

** San Rafael de Platanares, a village and district in the canton of Pérez Zeledón in the province of San José

** Edward Pérez, Greg García, ( engineers ), Freddie Martínez, Hugo Guerrero ( engineers & producers ) & The Legends for ¿ Qué Es Música Tejana?

** Alonso Pérez de Guzmán El Bueno, Castilian nobleman

** Alonso de Guzmán El Bueno, 7th Duke of Medina Sidonia, Castilian nobleman, descendant of Alonso Pérez de Guzmán

** WWC North American Tag Team Championship ( 1 time ) – with Miguel Pérez, Jr.

** Quarter Final: lost to Ivan Trevejo Pérez by 14 – 15 (→ 7. place )

** Villahermosa – Carlos Rovirosa Pérez International Airport

** Plaza Silverio Pérez, Texcoco

** Mérida-Juan Pablo Pérez Alfonso Airport

** Concierto de estío ( 1944 ; first performance, April 16, 1944, by Enrique Iniesta, at the Teatro San Carlos in Lisbon, Portugal, with the Orquesta Nacional de España, conducted by Bartolomé Pérez Casas )

** Trump Hollywood: A 40-story building on Hollywood Beach, Florida with Jorge M. Pérez.

** 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.