Évariste Galois (October 25, 1811 -- May 31, 1832) was a French mathematician born in Bourg-la-Reine. While still in his teens, he was able to determine a necessary and sufficient condition for a polynomial to be solvable by radicals, thereby solving a long-standing problem. His work laid the foundations for Galois theory, a major branch of abstract algebra, and the subfield of Galois connections. He was the first to use the word "group" as a technical term in mathematics to represent a group of permutations.
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There is no one mathematician credited with the invention of multiplication. Multiplication has been documented in Egyptian, Greek, Indian and Chinese civilizations.
Polish mathematician Waclaw Sierpinski was born on March 14th in 1882. Sierpinski is best known for his contributions to number theory, set theory, theory of functions, and topology.
He was a Polish mathematician who disagreed with Ptolemy's view that the earth is the center of the universe. The heliocentric theory is the theory that the sun is the center of the universe, not the earth.
Fermat
In abstract algebra, group theory studies structures known as groups. Group theory has three historical sources number theory, the theory of algebraic equations, and geometry.