All articles starting with H
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Hodge conjecture
The Hodge conjecture is an unsolved problem in algebraic geometry, posed by W. V. D. Hodge in 1950 and one of the Clay Millennium Prize Problems.
Hodge star operator
The Hodge star operator, also called Hodge duality, maps a p-form on an oriented inner product space to its complementary form, underpinning the Hodge Laplacian and Maxwell's equations.
Hodge structure
A Hodge structure is an algebraic structure on a real or rational vector space recording a decomposition into (p, q) pieces, introduced by W. V. D. Hodge.
Hodge theory
Hodge theory is the branch of mathematics that studies the topology of manifolds through harmonic differential forms, created by W. V. D. Hodge in the 1930s.
Hodgetwins
The Hodgetwins, also known as the Conservative Twins, are Keith and Kevin Hodge, twin brothers from Virginia who work in stand-up comedy and conservative political commentary.
Hodgkin lymphoma
Hodgkin lymphoma, also called Hodgkin disease, is a B-cell cancer of the immune system defined by Reed-Sternberg cells, with classic and nodular lymphocyte-predominant types, high cure rates, ABVD or BEACOPP chemotherapy, and PET-adapted treatment.
Hodgkin–Huxley model
The Hodgkin–Huxley model, also called the Hodgkin–Huxley equations, is a set of four differential equations published in 1952 that describes how action potentials are generated in nerve cells.
Hodgson Pratt
Hodgson Pratt (1824–1907) was a British Bengal civil servant turned peace campaigner who founded the journal Concord and helped found the Permanent International Peace Bureau.
Hodgy
Hodgy (Gerard Long, born 1990), since 2023 recording as Jerry, is an American rapper from Trenton, New Jersey, founding Odd Future member, one half of MellowHype with Left Brain, known for The Dena Tape and Fireplace: TheNotTheOtherSide.
Hodh ech Chargui
Hodh ech Chargui (ولاية الحوض الشرقي), easternmost wilaya of Mauritania, capital Néma, 182,700 km², 625,643 people (2023). Hot desert region bordering Mali, hosting Mbera camp and 260,000 Malian refugees, with 73.8% multidimensional poverty and an agro-pastoral economy.
Hodograph
A hodograph, also called a hodogram, is a plot of horizontal wind at successive heights, representing the vertical wind profile; meteorologists use its curve to judge storm types and rotation.
Hodowla jeleni, kucyków, kóz
Hodowla jeleni, kucyków, kóz, a zoo in Gmina Kocmyrzów-Luborzyca, Kraków County, Małopolskie, Poland, named for breeding deer, ponies, and goats; coordinates 50.14101 N, 20.13091 E.
Höðr
Höðr (Hǫðr, Hotherus), Norse god and son of Odin who kills Baldr with mistletoe; blind only in Snorri's Prose Edda, while Saxo's Høtherus is a sighted Danish prince rivaling Balderus for Nanna.
Hödr (crater on Callisto)
Hödr (Hodr) is a 76.5-km-wide IAU-approved impact crater on Callisto at 69.1N, 89.2W, named in 1979 after Baldr's blind brother in Norse mythology; distinct from the separate crater Höldr.
Hodrick–Prescott filter
The Hodrick–Prescott filter is an econometric method that splits a macroeconomic time series into trend and cycle, introduced to business-cycle study by Hodrick and Prescott in 1980.
Hoe (tool)
Hoe (tool): an angled-blade hand tool on a long handle for digging and weeding; types include draw, Dutch, and scuffle/stirrup (hula, action, oscillating) hoes; used since the Bronze Age and still central to smallholder farming.
Hoeam's case and the purge of Buddhist establishments
Hoeam's case and the purge of Buddhist establishments (회암사 사건) was an early Joseon reform of 1406 and 1424 that stripped Buddhist temples of state support.
Hoechst AG
Hoechst AG, formerly Farbwerke Hoechst, was a German chemical and pharmaceutical company founded in 1863 near Frankfurt as a coal tar dye factory; it joined I. G. Farben, produced Salvarsan and Lasix, and merged into Aventis in 1999, later Sanofi.
Hoeffding's inequality
Hoeffding's inequality, also called the Hoeffding bound, bounds the probability that a sum of bounded independent random variables deviates from its expectation using only the summands' ranges.
Hoegaarden Brewery
Hoegaarden Brewery (Brouwerij van Hoegaarden) is the Belgian AB InBev brewery whose witbier, revived by Pierre Celis in 1965–1966 after the last village brewery closed in 1957, restored the style of spiced white wheat beer; flagship beer is 4.9% ABV.
Hoegaarden monks
The Hoegaarden monks are the monastic brewers whom the Hoegaarden beer brand credits with creating the town's wheat beer recipe around 1445, now an AB InBev brand.
Hōei eruption of Mount Fuji
The Hōei eruption of Mount Fuji (宝永大噴火) was a violent eruption lasting 16 days from December 1707, blanketing Edo and the Kantō plain with ash.
Hōei famine
The Hōei famine was a severe food crisis in Sagami and Suruga provinces after Mount Fuji's 1707 eruption buried farmland under ash, ruining harvests for decades.
Hoek–Brown failure criterion
The Hoek–Brown failure criterion is an empirical criterion predicting the peak strength of intact rock and jointed rock masses, introduced by E. Hoek and E.T. Brown in 1980.
Hoelun
Hoelun, also rendered Hö'elün Eke, was the mother of Genghis Khan, who raised her children alone after her husband Yesügei was poisoned by Tatars around 1170.
Hoenir (crater on Callisto)
Hoenir is an 81.10 km diameter impact crater on Callisto at 33.70°S, 260.90°W, IAU-approved in 1979 and named for the Norse god who gave souls to the first humans.
Hoeryong concentration camp
Hoeryong concentration camp (Kwan-li-so No. 22) was a North Korean political prison camp at Hoeryong, North Hamgyong Province, built in the 1960s, holding up to 50,000 prisoners, and closed in 2012 with inmates transferred to Camp 16.
Hoest
Hoest is the stage name of Ørjan Stedjeberg, a Norwegian black metal musician from Bergen who founded the band Taake in 1993 and writes and records most of its music himself.
HOF Capital
HOF Capital is a New York-based venture capital firm founded in 2016, led by Hisham Elhaddad, Onsi Sawiris, and Fady Yacoub, investing in technical founders.
HOF Capital Strategic Opportunities Fund
HOF Capital Strategic Opportunities Fund is a Delaware venture capital fund formed in 2024 by HOF Capital, a New York firm founded in 2016, reporting a $500 million offering.