Fichera Convergence Theorem
Fichera is a surname. Notable people with the surname include: *Gaetano Fichera (1922–1996), Italian mathematician **Fichera's existence principle * Joseph Fichera, American business executive *Marco Fichera Marco Fichera (born 15 April 1993) is an Italian male épée fencer. Career Fichera took up fencing when he was ten years old under the guidance of maestro Domenico Patti at C.S. Acireale. In 2010 he took a double gold haul at the U17 European C ...

Gaetano Fichera
Gaetano Fichera (8 February 1922 – 1 June 1996) was an Italian mathematician, working in mathematical analysis, linear elasticity, partial differential equations and several complex variables. He was born in Acireale, and died in Rome. Biography He was born in Acireale, a town near Catania in Sicily, the elder of the four sons of Giuseppe Fichera and Marianna Abate. His father Giuseppe was a professor of mathematics and influenced the young Gaetano starting his lifelong passion. In his young years he was a talented football player. On 1 February 1943 he was in the Italian Army and during the events of September 1943 he was taken prisoner by the Nazist troops, kept imprisoned in Teramo and then sent to Verona: he succeeded in escaping from there and reached the Italian region of Emilia-Romagna, spending with partisans the last year of war. After the war he was first in Rome and then in Trieste, where he met Matelda Colautti, who became his wife in 1952. Education and academi ...
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Fichera's Existence Principle
In mathematics, and particularly in functional analysis, Fichera's existence principle is an existence and uniqueness theorem for solution of functional equations, proved by Gaetano Fichera in 1954. More precisely, given a general vector space and two linear maps from it onto two Banach spaces, the principle states necessary and sufficient conditions for a linear transformation between the two dual Banach spaces to be invertible for every vector in .See , , , . See also * * * * * Notes References *. A survey of Gaetano Fichera's contributions to the theory of partial differential equations, written by two of his pupils. *. *. *: for a review of the book, see . *. The paper ''Some recent developments of the theory of boundary value problems for linear partial differential equations'' describes Fichera's approach to a general theory of boundary value problems for linear partial differential equations through a theorem similar in spirit to the Lax–Milgram theorem. *. A mo ...
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Joseph Fichera
Joseph Sebastian Fichera is an American business executive known primarily for his work in the fields of investment banking and financial services. He is the CEO of Saber Partners, LLC, a public advisory firm that he co-founded in 2000. Prior to Saber, he worked for various Wall Street firms including Smith Barney, Harris Upham & Company, Prudential Securities and Bear Stearns & Co., as a managing director, principal. Fichera is the creator of share-adjusted broker-remarketed equity securities, also known as SABRES, as an alternative to auction rate securities. He is also considered an expert at auction rate securities, serving as an expert advisor for the U.S. Securities and Exchange Commission. Fichera was also one of California Governor Gray Davis' advisors, assisting with the California electricity crisis that took place in 2000 and 2001. Early life and education Fichera was born in Rochester, New York in 1954, his father a bookkeeper and his mother a hairdresser. His gra ...
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