Mathematicians -- E

Ferdinand Gotthold Eisenstein (1823-1852)

Born in Germany.
He defined the ordinal and generic characteristics of quadratic forms of an uneven determinant.
He assigned the weight of any order or genus.
He showed that the possibility of representing a number as the sum of squares is limited to eight squares.
Eratosthenes of Cyrene (ca. 276 BCE - ca. 195 BCE)

Born in Libya.
He devised a "sieve," which was a simple technique of finding prime numbers in a straightforward, algorithmic manner.
He devised a method to determine the circumference of the earth.
He provided the solution of the Delian problem of doubling the cube.
Euclid (fl. ca. 295 BCE)

Born in ?
He is the most celebrated mathematician of all time.
His Elements, which was studied down to modern times, is a collection of thirteen books of 465 propositions from plane and solid geometry and from number theory.
He presented the old mathematics in a clear, organized, and logical fashion.
Eudoxus of Cnidos (ca. 400 BCE)

Born in Turkey.
His theory of proportion provided a way around the problems created by the Pythagoreans' discovery of incommensurable magnitudes. The theory supplied valid proofs to theorems.
His method of exhaustion was applied in the determination of areas and volumes of the more sophisticated geometric figures.
Leonhard Euler (1707-1783)

Born in Switzerland.
He was able to do difficult calculations mentally, being able to retain in his head up to fifty places of accuracy.
He wrote books on differential and integral calculus, as well as on other mathematical topics.
He extended finite polynomials into infinite ones.