Hard
Encyclopedia
Hard or Hardness may refer to:
Music:
- Hardness, resistance of physical materials to change under force
- Hard waterHard waterHard water is water that has high mineral content . Hard water has high concentrations of Ca2+ and Mg2+ ions. Hard water is generally not harmful to one's health but can pose serious problems in industrial settings, where water hardness is monitored to avoid costly breakdowns in boilers, cooling...
, water with a high mineral content - NP-hardNP-hardNP-hard , in computational complexity theory, is a class of problems that are, informally, "at least as hard as the hardest problems in NP". A problem H is NP-hard if and only if there is an NP-complete problem L that is polynomial time Turing-reducible to H...
, a term used in Computational complexity theoryComputational complexity theoryComputational complexity theory is a branch of the theory of computation in theoretical computer science and mathematics that focuses on classifying computational problems according to their inherent difficulty, and relating those classes to each other... - Hard, AustriaHard, AustriaHard is a town in the westernmost Austrian state of Vorarlberg, directly on the Lake of Constance. It has a population of 11,471.Hard has a lot of attractions, like the Strandbad and the Grünerdamm.Hard is also famous for the big Skaterpark....
, a town in Austria - Hard (Zürich)Hard (Zürich)Hard is a quarter in the district 4 of Zurich.It was formerly a part of Aussersihl municipality, which was incorporated into Zurich in 1893.The quarter has a population of 12,715 distributed on an area of 1.46 km².-References:...
, a quarter in Zürich - Hard (tennis), a type of tennis court
- Hard (music festival)HARD (music festival)Hard is a national music festival, music cruise and concert brand founded by Gary Richards in 2007. The event line-ups consist of high-profile alternative, electronic and rock acts and cutting edge emerging talents. The first Hard Music Festival was held on December 31, 2007 in Downtown Los...
, concerts and live events - Hard, or hard-on, a slang term for an erectionErectionPenile erection is a physiological phenomenon where the penis becomes enlarged and firm. Penile erection is the result of a complex interaction of psychological, neural, vascular and endocrine factors, and is usually, though not exclusively, associated with sexual arousal...
- Hard (nautical)Hard (nautical)A hard is a firm or paved beach or slope by water that is convenient for hauling boats out of the water. The term is especially used in Hampshire, southern England.- See also :* Bucklers Hard, Hampshire* Priddy's Hard, Gosport, Hampshire...
, a firm or paved beach or slope convenient for hauling vessels out of the water - Hayward Area Recreation and Park DistrictHayward Area Recreation and Park DistrictThe Hayward Area Recreation and Park District is the park management agency for most of the parks in the city of Hayward, California and environs. It was created in 1944 and is an independent special district under California law. H.A.R.D. is the largest recreation district in California...
, abbreviated H.A.R.D.
Music:
- Hard (band)Hard (band)Hard is a Hungarian hard rock supergroup formed in late 2004 in Budapest, Hungary by József Kalapács and Gábor Mirkovics...
, a Hungarian hard rock supergroup - Hard (Brainpower album)Hard (Brainpower album)Hard is the fifth album by Dutch language rapper Brainpower. It was released April 21, 2008 on Lyric Recordings, together with his fourth album Hart and contains the single "Boks Ouwe"...
- Hard (Gang of Four album)Hard (Gang of Four album)Hard is the fourth studio album by the English post-punk group Gang of Four. It was originally released in 1983 on Warner Bros. Records and was the first album to not feature original member Hugo Burnham, while Dave Allen had already left before the previous album, Songs of the Free.The album was...
- Hard (Jagged Edge album)Hard (Jagged Edge Album)Hard is the fourth studio album by American R&B group Jagged Edge, released on October 14, 2003 . It peaked at number 3 on the Billboard 200 album charts...
- "Hard" (song)Hard (song)"Hard" is a song by Barbadian recording artist Rihanna from her fourth studio album, Rated R . It was written by Terius Nash, Christopher Stewart, Rihanna and American rapper Jeezy, who also provides featured vocals. Nash and Stewart produced the song under their respective stage names The-Dream...
, by Rihanna