Physical world and mathematics

Hartree–Fock method

The Hartree–Fock method, also called the self-consistent field method, is a quantum mechanical approximation introduced by Douglas Hartree in 1928 and Vladimir Fock in 1930.

Hartree–Fock–Bogoliubov method in nuclear physics

The Hartree–Fock–Bogoliubov (HFB) method is a self-consistent mean-field approach to nuclear structure that extends Hartree–Fock by allowing nucleon pairs to scatter between orbitals, treating open-shell nuclei as superfluids.

Oct 21, 2026

Haruj

Haruj (Al Haruj, هروج) is a large intraplate basaltic volcanic field of about 45,000 km2 in central Libya, at the SW margin of the Sirt Basin, with ~150 volcanoes and K-Ar ages of 6-0.4 Ma.

Harun Tüysüz

Harun Tüysüz is a Turkish chemist known for water-electrolysis catalysts based on abundant cobalt, nickel, and iron, leading a group at IMDEA Materials in Madrid since 2024.

Haruo Hosoya

Haruo Hosoya (細谷治) is a Japanese chemist and emeritus professor at Ochanomizu University in Tokyo, best known for introducing the Hosoya topological index in 1971.

Haruzo Hida

Haruzo Hida, born 1952 in Japan, is a number theorist at UCLA who created Hida theory, the study of p-adic analytic families of ordinary modular forms with large Galois representations.

Harvard Project Physics

Harvard Project Physics, later the Project Physics Course, was an American high-school physics curriculum developed at Harvard from 1964 to 1972, teaching physics through history.

Oct 15, 2026

Harvard-Smithsonian Center for Astrophysics

The Harvard-Smithsonian Center for Astrophysics, also known as the CfA, is a joint Harvard and Smithsonian astronomy research institution in Cambridge, Massachusetts, founded in 1973.

Harvey Brooks (physicist)

Harvey Brooks (1915–2004) was an American applied physicist who served as dean of Harvard's engineering school from 1957 to 1975 and led national science policy.

Harvey D. Tananbaum

Harvey D. Tananbaum is an American X-ray astrophysicist at the Smithsonian Astrophysical Observatory, best known as the founding director of the Chandra X-ray Center from 1991 to 2014.

Harvey Fletcher

Harvey Fletcher (1884–1981) was an American physicist who directed acoustical research at Bell Telephone Laboratories and pioneered stereophonic sound, the vacuum-tube hearing aid, and loudness measurement.

Harvey Friedman (mathematician)

Harvey Friedman is an American mathematical logician, emeritus professor at Ohio State University, and founder of reverse mathematics, which determines which axioms are needed to prove theorems.

Harvey Raymond Butcher

Harvey Raymond Butcher, born 1947 in Salem, Massachusetts, is a Dutch-American astronomer best known as co-discoverer of the Butcher–Oemler effect, the excess of blue galaxies in distant rich clusters.

Oct 20, 2026

Hasandag-Keciboyduran Volcanic Complex

The Hasandag-Keciboyduran Volcanic Complex (Hasandağ-Keçiboyduran volkanik kompleksi) is a volcanic field in Central Anatolia, Turkey, centered on Hasan Dağı, a double-peaked stratovolcano rising to 3253 m.

Hasegawa–Mima equation

The Hasegawa–Mima equation is a nonlinear partial differential equation proposed by Akira Hasegawa and Kunioki Mima in 1978 to describe drift wave turbulence in magnetized plasmas.

Oct 15, 2026

Hashemite (mineral)

Hashemite is a rare barium chromate mineral, Ba(Cr,S)O₄, isostructural with baryte, first described in 1983 from west-central Jordan and named for the Hashemite Kingdom of Jordan.

Haskell Curry

Haskell Brooks Curry (1900–1982) was an American mathematician and logician who founded combinatory logic at Penn State; currying, Curry's paradox, and the Haskell language bear his name.

Hasse diagram

A Hasse diagram is a drawing of a finite partially ordered set, showing an edge between two elements exactly when one covers the other, with greater elements higher.

Hasse norm theorem

The Hasse norm theorem, Hasse's theorem on cyclic extensions, is a 1931 result of Helmut Hasse: in a cyclic extension of number fields, being a norm locally everywhere is equivalent to being a global norm.

Hasse principle

The Hasse principle, also called the local-global principle, is a statement in number theory about when solutions to equations over the rational numbers follow from local solutions.

Hasselblad

Hasselblad, formally Victor Hasselblad AB, is a Swedish camera manufacturer in Gothenburg, founded as a trading firm in 1841, whose cameras photographed NASA's Moon landings.

Oct 22, 2026

Hasselblad 500C

The Hasselblad 500C is a Swedish 6×6 cm medium-format SLR launched in 1957, the first Hasselblad V System camera, with a leaf shutter in each Carl Zeiss lens.

Hassium

Hassium (Hs, atomic number 108), formerly called unniloctium, is a synthetic radioactive element discovered in 1984 in Darmstadt, Germany, and named after the state of Hesse.

Hassler Whitney

Hassler Whitney (1907–1989) was an American mathematician who founded differential topology, proved the Whitney embedding theorems, and introduced matroid theory, working at Harvard and the Institute for Advanced Study.

Oct 22, 2026

Hat monotile

The hat monotile is a 13-sided shape discovered by David Smith in 2023 that tiles the plane with one shape but never periodically, solving the long-standing einstein problem.

Hatice Altug

Hatice Altug is a Turkish physicist and engineer, a full professor at EPFL since 2020 who leads its Bionanophotonic Systems Laboratory, known for nanophotonic and plasmonic biosensing and metasurface molecular barcoding.

Hatten Yoder

Hatten Yoder (1921–2003) was an American experimental petrologist who spent fifty-five years at the Carnegie Institution's Geophysical Laboratory, directing it from 1971 to 1986, and whose basalt-melting experiments established how magmas form in the mantle.