Formulario Mathematico (interlingua: Formulation of mathematics) is a book by Giuseppe Peano which expresses fundamental theorems of mathematics in a symbolic language developed by Peano. Written in interlingua, it was first published in 1895 and the fifth and last edition was published in 1908. This article describes the international auxiliary language created by the IALA. For other usages of the term interlingua, see Interlingua (disambiguation). ... Jump to: navigation, search Giuseppe Peano Giuseppe Peano (August 27, 1858 – April 20, 1932) was an Italian mathematician and philosopher best known for his contributions to set theory. ... 1895 was a common year starting on Tuesday (see link for calendar). ...

Peano was assisted by Giovanni Vailati, Mario Pieri, Alessandro Padoa, Giovanni Vacca, Vincenzo Vivanti, Gino Fano and Cesare Burali-Forti. Giovanni Vailati (24 April 1863 - 14 May 1909) was an Italian mathematician. ... Mario Pieri (22 June 1860 - 1 March 1913) was an Italian mathematician. ... Alessandro Padoa (14 October 1868 - 25 November 1937) was an Italian mathematician. ... Giovanni Enrico Eugenio Vacca (18 November 1872 - 6 January 1953) was an Italian mathematician. ... Gino Fano (5 January 1871 - 8 November 1952) was an Italian mathematician. ... Cesare Burali-Forti (13 August 1861 - 21 January 1931) was an Italian mathematician. ...

Many of the symbols and abbreviations introduced in the book are now in common use. Examples include ∈, ⊂, ∩, ∪ and A−B. A is a subset of B If X and Y are sets and every element of X is also an element of Y, then we say or write: X is a subset of (or is included in) Y; X ⊆ Y; Y is a superset of (or includes) X; Y ⊇ X... In mathematics, the intersection of two sets A and B is the set that contains all elements of A that also belong to B (or equivalently, all elements of B that also belong to A), but no other elements. ... In set theory and other branches of mathematics, the union of a collection of sets is the set that contains everything that belongs to any of the sets, but nothing else. ... In set theory and other branches of mathematics, two kinds of complements are defined, the relative complement and the absolute complement. ...