Editing William Rowan Hamilton (section)

==Legacy==
[[File:2003 Ireland 10 Euro Sir William Hamilton Reverse.jpg|thumb|200px|[[Euro gold and silver commemorative coins (Ireland)|Irish commemorative coin]] celebrating the 200th anniversary of his birth]]
A plaque under the Broom Bridge, associated with the discovery of quaternions, was unveiled by [[Éamon de Valera]] on 13 November 1958.<ref>[http://www-history.mcs.st-and.ac.uk/history/Biographies/De_Valera.html De Valera] {{Webarchive|url=https://web.archive.org/web/20120401181844/http://www-history.mcs.st-and.ac.uk/history/Biographies/De_Valera.html |date=1 April 2012 }} School of Mathematics and Statistics
University of St Andrews, Scotland</ref><ref>{{Cite web|url=http://www.daviddarling.info/encyclopedia/H/Hamilton.html|title=Hamilton, William Rowan (1805–1865)|first=David|last=Darling|website=www.daviddarling.info|access-date=6 April 2011|archive-date=10 February 2005|archive-url=https://web.archive.org/web/20050210065259/http://www.daviddarling.info/encyclopedia/H/Hamilton.html|url-status=live}}</ref> Since 1989, the [[National University of Ireland, Maynooth]], has organised a pilgrimage called the ''[[Hamilton Walk]]'', in which mathematicians take a walk from Dunsink Observatory to the bridge, where no trace of the carving remains, though a stone plaque does commemorate the discovery.<ref name="hw20">[http://www.maths.tcd.ie/pub/ims/bull65/M6501.pdf Twenty Years of the Hamilton Walk] {{Webarchive|url=https://web.archive.org/web/20120316003357/http://www.maths.tcd.ie/pub/ims/bull65/M6501.pdf |date=16 March 2012 }} by Fiacre Ó Cairbre, Department of Mathematics, 
National University of Ireland, Maynooth (2005), Irish Math. Soc. Bulletin 65 (2010)</ref>

The [[Hamilton Institute]] is an applied mathematics research institute at [[Maynooth University]] and the [[Royal Irish Academy]] holds an annual public Hamilton lecture at which [[Murray Gell-Mann]], [[Frank Wilczek]], [[Andrew Wiles]] and [[Timothy Gowers]] have all spoken. 2005 was the 200th anniversary of Hamilton's birth and the Irish government designated that the ''Hamilton Year, celebrating Irish science''. [[Trinity College Dublin]] marked the year by launching the [[Hamilton Mathematics Institute]].<ref name=HMI>{{cite web|title=About HMI|url=http://hamilton.tcd.ie/?subsite=main&section=about|website=hamilton.tcd.ie|publisher=Trinity College, Dublin|access-date=1 April 2015|archive-date=17 July 2006|archive-url=https://web.archive.org/web/20060717024533/http://hamilton.tcd.ie/?subsite=main&section=about|url-status=live}}</ref>

Two [[commemorative stamp]]s were issued by Ireland in 1943 to mark the centenary of the announcement of quaternions.<ref name=Colnect.com>{{cite web|title=William Rowan Hamilton|url=https://colnect.com/en/stamps/list/country/2616-Ireland/series/10231-William_Rowan_Hamilton/theme/23-Sculptures/year/1943|website=colnect.com|access-date=8 October 2018}}</ref> A 10-[[euro]] commemorative silver [[proof coin]] was issued by the [[Central Bank of Ireland]] in 2005 to commemorate 200 years since his birth.

=== Commemorations ===

[[File:William Rowan Hamilton Plaque.jpg|thumb|The plaque on the birthplace of William Rowan Hamilton on Dominick Street in Dublin]]

{{Main|List of things named after William Rowan Hamilton}}
* [[Hamilton's equations]] are a formulation of classical mechanics.
* Numerous other concepts and objects in mechanics, such as [[Hamilton's principle]], [[Hamilton's principal function]], the [[Hamilton–Jacobi equation]], [[Cayley–Hamilton theorem|Cayley-Hamilton theorem]] are named after Hamilton. 
* The Hamiltonian is the name of both a [[Hamiltonian mechanics|function]] (classical) and an [[Hamiltonian (quantum mechanics)|operator]] (quantum) in physics, and, in a different sense, a term from [[graph theory]].
* The algebra of [[quaternions]] is usually denoted by {{math|'''H'''}}, or in [[blackboard bold]] by '''<math>\mathbb{H}</math>''', in honour of Hamilton.
* The Hamilton Building at Trinity College Dublin is named after him.<ref>{{Cite web |url=https://www.google.com/maps/place/Hamilton+Building/@53.3431379,-6.2528483,17z/data=!3m1!4b1!4m5!3m4!1s0x48670e90ff2c9f6d:0x4d8738ad2983146b!8m2!3d53.3431379!4d-6.2506596 |title=Hamilton Building TCD |access-date=8 May 2020 |archive-date=26 September 2021 |archive-url=https://web.archive.org/web/20210926202756/https://www.google.com/maps/place/Hamilton+Building/@53.3431379,-6.2528483,17z/data=%213m1%214b1%214m5%213m4%211s0x48670e90ff2c9f6d:0x4d8738ad2983146b%218m2%213d53.3431379%214d-6.2506596 |url-status=live }}</ref>