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He introduced the ideas or abstractions.

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He presented deductive and systematized reasoning.

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He has had the greatest influence on mathematicians, by establishing the axiomatic method.

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They developed a large number of calculation methods (multiplication tables, square root tables...). Thay didn't develop methods to analyse the correctness of their results.

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They invented the "zero".

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He wrote a book called "Liber Abaci" that introduced the arabic number into Europe.

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He demonstrated that numbers could be negative

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Began to use letters to symbolize unknown values.

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Laid the foundations for mathematical formulation.

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Ivented logarithms.

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Invented a precursor to the calculation rule.

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Built the first digital calculator. He died so his invention had no diffusion.

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Discovered analytical geometry.

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He is regarder the inventor of the calculator. His calculator was less advanced than Schickard's.

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He was the co-inventor (with Isaac Newton) of the calculus.

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He proposed two computer machines moved by steam machines "The Difference Machine" and  "The Analytical Machine".

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Developed the first "programs" for Babbage's computers and laid the foundations for programming languages.

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He managed to biuld a highly specialized "differential" machine.

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He published a very important book called "An Investigation into the Laws of Truth".

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He created a punch card to control de census.
In 1896 he created his own company "Tabulating Machine Company" later "International Business Machines"

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Designed the first fully electronic digital computer with Clifford E. Berry. He built The ABC (Atanasoff Berry Computer)

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He created "MARK 1", a machine capable of multiplying and dividing numbers.

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He did lots of good contributions in the computers, that make him a very famous person in the "world of computers".

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He's the designer of ENIAC, the first large-scale digital computer.

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They built the commercial UNIVAC. (FIST GENERATION)

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He developed the first high-level language the FORTRAN (FORmula TRANslator)

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She developed the high-level language COBOL (Common Business-Oriented Language).

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Wrote an essay on the concept of the Intergalactic Network, where the whole world is interconnected and can access programs and data from anywhere on the planet.

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He developed the high-level language PASCAL.

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He began the development of the protocol called TCP / IP, a protocol aimed at communicating some networks over others, the Internet Protocol or IP.

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Novelized the new world and coined the term "cyberspace".