H

Thomas Harriot (1560-1621)

Born in England.
He was instrumental in extending and codifying the theory of equations.
He was the first to use > and < to indicate greater than and less than.
Felix Hausdorff (1862-1942)

Born in Germany.
He developed the branch of mathematics known as topology.
He formaulated a maximal principle in general set theory.
Jacques Herbrand (1908-1931)

Born in France.
He formaulated a theory which established a link between quantification theory and sentential logic.
Charles Hermite (1822-1901)

Born in France.
He applied elliptic functions to find solutions of the quintic equation and of Lamé's differential equation..
He discussed the theory of associated covariants in binary quantics and the theory of ternary quantics
Heron (Hero of Alexandria) (fl. 62 CE)

Born in Egypt.
His formula provides the area of a triangle when the lengths of the three sides are known, but the height is not known.
David Hilbert (1862-1943)

Born in Prussia.
He solved all the known problems of algebraic invariants.
He introduced sweepng developments and new areas for research in algebraic topography.
Hipparchus of Rhodes ca. 180 - ca. 125 BCE)

Born in Greece.
His mathematical computations to chart the sun, moon, and stars led to his being named the founder of trigonometry.
He is also considered the founder of Greek astronomy.
Hippias (fl. ca.420 BCE)

Born in Greece.
He invented a curve called the quadratrix, by the means of which an angle can be divided into any given ratio.
Hippocrates of Chios (fl. 2nd half of 5th century BCE)

Born in Greece.
He is credited with the first exposition which developed the theorems of geometry and logically from a few given axioms or postulates, in Elements.
He formulated the quadrature of the lune, that is, the construction of a square having area equal to that of the original plane figure, using only a compass and a straightedge.
John de Holywood (Sacrobosco) (ca.1200 - ca.1256)

Born in England.
His work on arithmetic was a standard authority for many years
Hypathia (370-414 CE)

Born in Egypt.
Very little is known of her work, although it is believed that she was an algebraist.
She seemed to have had an interest in conic sections.