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Welsh mathematician and inventor of the equals sign
Robert Recorde (c. 1510 – 1558) was a Welsh physician and mathematician. He invented the equals sign (=) and also introduced the pre-existing plus (+)
Robert_Recorde
Mathematical symbol of equality
code point U+003D. It was invented in 1557 by the Welsh mathematician Robert Recorde. Prior to 16th century there was no common symbol for equality, and
Equals_sign
Book by Robert Recorde
The Whetstone of Witte is the shortened title of Robert Recorde's mathematics book published in 1557, the full title being The whetstone of witte, whiche
The_Whetstone_of_Witte
Mathematical formula expressing equality
"=" symbol, which appears in every equation, was invented in 1557 by Robert Recorde, who considered that nothing could be more equal than parallel straight
Equation
English arithmetic textbook
Robert Recorde's Arithmetic: or, The Ground of Arts was one of the first printed English textbooks on arithmetic and the most popular of its time. The
The_Ground_of_Arts
Obsolete mathematical term representing the eighth power of a number
words rather than as superscript numbers. This term was suggested by Robert Recorde, a 16th-century Welsh physician, mathematician, and writer of popular
Zenzizenzizenzic
In his 1557 work The Whetstone of Witte, British mathematician Robert Recorde proposed an exponent notation by prime factorisation, which remained in use
Prime factor exponent notation
Prime_factor_exponent_notation
Church in Tenby, Wales
Tudor from King Richard III. There is also a wall tablet in memory of Robert Recorde, an Elizabethan scholar, who introduced the equals sign ( = ) to mathematical
St_Mary's_Church,_Tenby
Mathematicians of Welsh nationality
MacTutor History of Mathematics Archive, University of St Andrews "Robert Recorde / 100 Welsh Heroes / 100 Arwyr Cymru". 2004-04-18. Archived from the
List_of_Welsh_mathematicians
Stifel In handwritten notes. 1556 Nicolo Tartaglia = equals sign 1557 Robert Recorde . decimal separator 1593 Christopher Clavius × multiplication sign 1618
Table of mathematical symbols by introduction date
Table_of_mathematical_symbols_by_introduction_date
Result of multiplying seven instances of a number
8031810176, ... (sequence A001015 in the OEIS) In the archaic notation of Robert Recorde, the seventh power of a number was called the "second sursolid". Leonard
Seventh_power
Mathematical symbols (+ and −)
the modern sense is attested in a 1518 book by Henricus Grammateus. Robert Recorde, the designer of the equals sign, introduced plus and minus to Britain
Plus_and_minus_signs
College of the University of Oxford
David Pannick Derek Parfit Anthony Quinton Sarvepalli Radhakrishnan Robert Recorde Catherine Redgwell John Redwood A. L. Rowse Katherine Rundell Peter
All_Souls_College,_Oxford
Mathematical symbol
diagonals appear in diagrams involving multiplied numbers, such as Robert Recorde's The Ground of Arts and Oswald Schreckenfuchs's 1551 edition of Almagest
Multiplication_sign
Result of multiplying eight instances of a number together
152587890625 ... (sequence A001016 in the OEIS) In the archaic notation of Robert Recorde, the eighth power of a number was called the "zenzizenzizenzic". Polynomial
Eighth_power
Former prison in Southwark, London
Robinson (poet; imprisoned in 1775 with her husband for his debts) Robert Recorde (mathematician; imprisoned for debt, died there in 1558) John Rushworth
King's_Bench_Prison
Educational puzzle to be solved by symbol manipulation
translation as Compendio de Algebra de Abenbéder and reviewed in Nature. Robert Recorde first published The Ground of Arts in 1543. Firstly, it was almost all
Exercise_(mathematics)
Basic notion of sameness in mathematics
mathematics for equality, was first recorded by Welsh mathematician Robert Recorde in The Whetstone of Witte (1557), just one year before his death. The
Equality_(mathematics)
Most common system for writing numbers
numerals Adam Ries, Rechenung auff der linihen und federn (2nd Ed.), 1525 Robert Recorde, The ground of artes, 1543 Peter Apian, Kaufmanns Rechnung, 1527 Adam
Hindu–Arabic_numeral_system
French mathematician (1540–1603)
other hand, from the German school of Coss, the Welsh mathematician Robert Recorde (1550) and the Dutchman Simon Stevin (1581) brought an early algebraic
François_Viète
complex numbers. 1556: Niccolò Tartaglia introduces parenthesis. 1557: Robert Recorde introduces the equal sign. 1564: Gerolamo Cardano is the first to produce
Timeline of scientific discoveries
Timeline_of_scientific_discoveries
Guidobaldo del Monte John Napier Pedro Nunes William Oughtred Luca Pacioli Robert Recorde Niccolò Fontana Tartaglia Galileo Ludovico Ariosto Martin Bauzer Luís
List_of_Renaissance_figures
Person with an extensive knowledge of mathematics
Gerolamo Cardano (earliest founder of probability and binomial expansion); Robert Recorde (physician) and François Viète (lawyer). As time passed, many mathematicians
Mathematician
2003–04 opinion poll
(62 votes) Gerald of Wales, (1146–1223) bishop and writer (60 votes) Robert Recorde, (1512–1558) mathematician (57 votes) David Edward Hughes, (1831–1900)
100_Welsh_Heroes
Ratio of two numbers
doi:10.1007/978-1-349-05230-1_2. Jack Williams (19 November 2011). Robert Recorde: Tudor Polymath, Expositor and Practitioner of Computation. Springer
Fraction
1543 book by Copernicus describing his heliocentric theory of the universe
predecessors had used Regiomontanus' Table of the Stars. In England, Robert Recorde, John Dee, Thomas Digges and William Gilbert were among those who adopted
De revolutionibus orbium coelestium
De_revolutionibus_orbium_coelestium
Arithmetic operation, inverse of nth power
or "mute"). Gerard of Cremona (c. 1150), Fibonacci (1202), and then Robert Recorde (1551) all used the term to refer to "unresolved irrational roots",
Nth_root
list of inventions and discoveries made in Wales or by Welsh people. Robert Recorde (c. 1512 – 1558) was a Welsh physician and mathematician. He invented
List of Welsh inventions and discoveries
List_of_Welsh_inventions_and_discoveries
1502 Rhys Nanmor - Elegy on the death of Arthur, Prince of Wales 1540 Robert Recorde - The Grounde of Artes 1542 Andrew Boorde - Fyrst Boke of the Introduction
16th_century_in_Wales
Seaside town and community in Pembrokeshire, Wales
Golf Course that provides links golf by the coast.[citation needed] Robert Recorde (c. 1512 – 1558), Anglo-Welsh physician and mathematician. Sir William
Tenby
Born/lived in Newtown, Montgomeryshire (Powys). Robert Recorde Very influential physician and mathematician. Robert published some of the most important books
List_of_Welsh_inventors
County and historic county in southwest Wales
at Pembroke Castle. Robert Recorde, inventor of the equals sign (=) in mathematics was from Tenby. The pirate Bartholomew Roberts was born in Casnewydd
Pembrokeshire
Calendar year
Hampton School, Hampton, London, by Robert Hammond. Repton School, by Sir John Port. Welsh-born mathematician Robert Recorde publishes The Whetstone of Witte
1557
Large-caliber gun
gunpowder or slow matches. His book acknowledged mathematicians such as Robert Recorde and Marcus Jordanus as well as earlier military writers on artillery
Cannon
Arithmetic operation
exponent was coined in 1544 by Michael Stifel. In the 16th century, Robert Recorde used the terms "square", "cube", "zenzizenzic" (fourth power), "sursolid"
Exponentiation
(1836–1908, EW), novelist Helen Raynor (born 1972, E), scriptwriter Robert Recorde (c. 1512–1558, E), mathematician Evan Rees (Dyfed, 1850–1923, W), poet
List_of_Welsh_writers
universe. It is often cited as the beginning of the Scientific Revolution. Robert Recorde publishes The Grounde of Artes, teaching the Worke and Practise of Arithmeticke
1543_in_science
Teaching, learning, and scholarly research in mathematics
mathematics textbooks to be written in English and French were published by Robert Recorde, beginning with The Grounde of Artes in 1543. However, there are many
Mathematics_education
performance. When the Muscovy Company was founded in 1551, they commissioned Robert Recorde to write mathematical books for the use of their navigators. They aimed
Mathematical_practitioner
at the University of Wales Emyr Jones Parry, scientist and diplomat Robert Recorde, physician and mathematician Emlyn Rhoderick, solid state physicist
List_of_Welsh_scientists
Nash-Williams, archaeologist Robert Recorde (1510–1558), mathematician and physician; inventor of the 'equals' sign in mathematics Gareth Roberts (1940–2007), physicist
List_of_Welsh_people
Type of mathematical expression
write 3x + 2y + z = 29. The earliest known use of the equal sign is in Robert Recorde's The Whetstone of Witte, 1557. The signs + for addition, − for subtraction
Polynomial
British computer scientist
101772. J V Tucker, Robert Recorde: data, computation and the Tudor knowledge economy, in G Roberts and F Smith (ed), Robert Recorde: Life and Work, University
John_V._Tucker
Calendar year
Campbell, 4th Earl of Argyll, Scottish nobleman and politician (b. 1507) Robert Recorde, Welsh physician and mathematician (b. c. 1512) Chisholm, Hugh, ed.
1558
Result of multiplying six instances of a number
{\displaystyle y} nonzero or infinitely many of them. In the archaic notation of Robert Recorde, the sixth power of a number was called the "zenzicube", meaning the
Sixth_power
English mathematician and Anglican cleric (1791–1858)
Peacock's principle. One of the earliest English writers on arithmetic is Robert Recorde, who dedicated his work to King Edward VI. The fact is that even in
George_Peacock
Calendar year
IV, Marquess of Montferrat, Italian nobleman (d. 1530) date unknown Robert Recorde, Welsh physician and mathematician (d. 1558) Gissur Einarsson, first
1512
Numerical method used to approximate solutions of univariate equations
be memorized and carried out by rote. Indeed, the rule as given by Robert Recorde in his Ground of Artes (c. 1542) is: Gesse at this woorke as happe doth
Regula_falsi
the Leopard Man of Peckham". The Guardian. London. Retrieved 2008-08-15. "Robert Browning - Biography". The Victorian Web. Retrieved 2008-08-15. The Feminist
List of people from the London Borough of Southwark
List_of_people_from_the_London_Borough_of_Southwark
1823. Electron and isotopes discovered – J. J. Thomson Equals sign Robert Recorde Erbium-doped fibre amplifier – Sir David N. Payne Faraday cage – Michael
List of British innovations and discoveries
List_of_British_innovations_and_discoveries
Defunct library in Norwich, England
Sphaera, Basle 1565 Georg Purbach, Theoricae novae Planetarum, Basle 1568 Robert Recorde, Whetstone of Witte, 1557 Regiomontanus, Tabulae Directionum & Prosectionum
Library_of_Sir_Thomas_Browne
English printer (died 1573)
published works by Archbishop Cranmer, the antiquarian John Leland, Robert Recorde and Archbishop Parker. In 1548, he conceived a project for a "Universal
Reginald_Wolfe
gunpowder or slow matches. His book acknowledged mathematicians such as Robert Recorde and Marcus Jordanus as well as earlier military writers on artillery
Nathaniel_Nye
Italian-born polymath (born 1484) Jean Fernel, French physician (born 1497) Robert Recorde, Welsh-born physician and mathematician (born c. 1512) approx. date
1558_in_science
English politician, Lord Deputy of Ireland (died 1590)
the state of mining in Ireland and a controversy between the miners Robert Recorde and Joachym Goodenfynger. He acquired Tintern Abbey which later passed
James_Croft
Good Pointes of Husbandrie. Welsh-born physician and mathematician Robert Recorde publishes The Whetstone of Witte in London, the first English book on
1557_in_science
2008 single-volume encyclopedia
well as key facts, such as: the equals sign was created by Welshman Robert Recorde of Tenby in the 1540s; Felinfoel was the first brewery to can beer in
Encyclopaedia_of_Wales
Library in Aberystwyth, Wales
Tobacco] (1718), the only extant copy. Early editions of Morgan Llwyd, Robert Recorde, Henry and Thomas Vaughan, and the epigrammist John Owen. A comprehensive
National_Library_of_Wales
Decade
Hampton School, Hampton, London, by Robert Hammond. Repton School, by Sir John Port. Welsh-born mathematician Robert Recorde publishes The Whetstone of Witte
1550s
Origin and evolution of the symbols used to write equations and formulas
Niccolò Tartaglia used parentheses for precedence grouping. In 1557 Robert Recorde published The Whetstone of Witte, which introduced the equal sign (=)
History of mathematical notation
History_of_mathematical_notation
1992 British TV series or programme
Richard Trevithick: Ran world's first steam locomotive at Merthyr. Robert Recorde: Invented equals sign. Hugh Owen Thomas (and the bonesetters of Anglesey):
Local Heroes (British TV series)
Local_Heroes_(British_TV_series)
Civil parish in County Wexford, Ireland
Colfer 2004, p. 38. Williams, Jack (2011). "The Affair at Clonmines". Robert Recorde. History of Computing. pp. 35–52. doi:10.1007/978-0-85729-862-1_4.
Clonmines
Manor house in Cheshire, England
tympana have plaster depictions of Destiny and Fortune, copied from Robert Recorde's Castle of Knowledge of 1556. The inscriptions read "The wheel of fortune
Little_Moreton_Hall
Decade
IV, Marquess of Montferrat, Italian nobleman (d. 1530) date unknown Robert Recorde, Welsh physician and mathematician (d. 1558) Gissur Einarsson, first
1510s
English mathematician
fabrica et usu, a copy of which was seen by John Bale in the library of Robert Recorde, and De Sphæra solida, are late attributions. North, J. D. "Batecombe
William_Batecumbe
Hampton School, Hampton, London, by Robert Hammond; and Repton School, Derbyshire, by Sir John Port. Robert Recorde's The Whetstone of Witte is published
1550s_in_England
Guevara's Reloj de Principes, chiefly from Marcus Aurelius's Meditations) Robert Recorde – The Whetstone of Witte Hans Staden – Warhaftige Historia und beschreibung
1557_in_literature
2008 history of mathematics book
approach: the contributions of Plato, Euclid, Archimedes, Boethius, Robert Recorde, Nicole Oresme, Johannes Kepler, Galileo Galilei, Isaac Barrow and Isaac
From Summetria to Symmetry: The Making of a Revolutionary Scientific Concept
From_Summetria_to_Symmetry:_The_Making_of_a_Revolutionary_Scientific_Concept
that), its publication started in 1939 and is still unfinished today. Robert Recorde Written in 1542, it was the first really popular arithmetic book written
List of publications in mathematics
List_of_publications_in_mathematics
Gerardus Mercator, Flemish cartographer (died 1594) approx. date – Robert Recorde, Welsh-born mathematician and physician (died 1558) February 22 – Amerigo
1512_in_science
Portuguese footballer (born 1985)
Manchester Evening News. Retrieved 10 October 2021. "Cristiano Ronaldo bate recorde europeu de internacionalizações". Maisfutebol (in Portuguese). Archived
Cristiano_Ronaldo
Country in South America
Ministério do Turismo (13 January 2012). "Turismo Brasileiro com novo recorde em 2011". No Pátio | tudo de bom acontece aqui. (in Portuguese). No Pátio
Brazil
English astrologer and mathematician
introductory arithmetic textbook which was second in popularity only to Robert Recorde's The Grounde of Artes during the late sixteenth and seventeenth centuries
Humphrey_Baker
Brazilian footballer (born 1992)
December 2025. Retrieved 6 July 2026. "Neymar vai para a quarta Copa e iguala recorde entre brasileiros; veja a lista" [Neymar will go to his fourth World Cup
Neymar
State in Brazil
de (April 10, 2019). "Produção de café conilon avança e pode ter safra recorde em 2019 gerando emprego e renda". Governo do Estado de Rondônia. Rondônia
Rondônia
Association football club in Lisbon, Portugal
original on 18 November 2015. Retrieved 8 February 2015. "Época a época: Recorde aqui todos os vencedores de A BOLA de Prata". A Bola. 27 May 2023. Arotaritei
Sporting_CP
Men's association football team
February 2024. Retrieved 4 June 2024. "Neymar vai para a quarta Copa e iguala recorde entre brasileiros; veja a lista" [Neymar will go to his fourth World Cup
Brazil_national_football_team
Retrieved 17 March 2025. "Metrô supera 117 milhões de usuários em 2024 e bate recorde" (in Portuguese). 21 January 2025. Retrieved 24 March 2025. [1] This ridership
List_of_metro_systems
American singer-songwriter (born 1985)
Retrieved February 2, 2024. Araujo, Raphael (May 17, 2024). "Bruno Mars quebra recorde de maior turnê internacional no Brasil". OFuxico (in Portuguese). Retrieved
Bruno_Mars
2023–2024 concert tour by Taylor Swift
July 20, 2026. Toledo, Marina (November 27, 2023). "Taylor Swift bate recorde de público no Allianz Parque nos três shows em SP" [Taylor Swift breaks
The_Eras_Tour
Katy Perry records and achievements
archival service (link) Torres, Leonardo (July 2, 2025). "Katy Perry quebra recorde inédito no YouTube com videografia de bilhões" [Katy Perry breaks YouTube
List of Katy Perry records and achievements
List_of_Katy_Perry_records_and_achievements
September 2024. Oliveira, Luccas. "Inter vende destaque da Olimpíada por valor recorde no futebol feminino". CNN Brasil (in Brazilian Portuguese). Retrieved 14
List of most expensive women's association football transfers
List_of_most_expensive_women's_association_football_transfers
Portuguese footballer (born 1999)
October 2016. Retrieved 18 June 2019. "Cher Ndour faz história e bate recorde de João Félix". Record. Archived from the original on 3 May 2021. Retrieved
João_Félix
Porto: Pepe marca em noite de 'Champions' e faz novamente história ao bater recorde... que lhe pertencia" [FC Porto: Pepe scores in 'Champions' night and makes
European Cup and UEFA Champions League records and statistics
European_Cup_and_UEFA_Champions_League_records_and_statistics
occasions, five on six occasions, and once scored eight". Complex Networks. "Recorde de Edmundo de 6 gols contra União São João completa 15 anos – NETVASCO"
List of footballers with the most goals in a single game
List_of_footballers_with_the_most_goals_in_a_single_game
April 2019. Retrieved 19 July 2018. "Herói da Croácia, Livaković iguala recorde de defesas de pênaltis em Copas do Mundo". O Globo (in Portuguese). 5 December
FIFA World Cup records and statistics
FIFA_World_Cup_records_and_statistics
Brazilian hurdler (born 2000)
quebra recorde mundial, e Alison é 2º com recorde sul-americano". Globo Esporte (in Portuguese). 1 July 2021. "Alison dos Santos vence e bate recorde sul-americano
Alison_dos_Santos
201. ISBN 978-0521766456. Retrieved August 16, 2015. Roberts, Gareth Ffowc (2022). For the Recorde: A History of Welsh Mathematical Greats. University
History_of_the_Internet
Portuguese footballing career
July 2016. "Cristiano Ronaldo equals Michel Platini's Euros goal-scoring recorde". ESPN. 7 July 2016. Archived from the original on 7 July 2016. Retrieved
Career_of_Cristiano_Ronaldo
1983 studio album by David Bowie
rapidamente 2 milhoes de copias vendidos nos Estados Unidos, onde David tinha um recorde modesto, para os padroes americanos, de 10 milhoes de discos vendidos em
Let's Dance (David Bowie album)
Let's_Dance_(David_Bowie_album)
LGBTQ celebration event
Retrieved July 9, 2019. Ripardo, Sérgio (May 28, 2008). "Guinness exclui recorde da Parada Gay - 28/05/2008". Folha Online. Retrieved July 9, 2019. Lawler
Pride_parade
Press, 2009), ISBN 0-19-532762-4, pp. 197–238. "Amália morreu há 15 anos: recorde a vida da rainha do fado". Blitz (in Portuguese). October 6, 2014. Archived
Honorific nicknames in popular music
Honorific_nicknames_in_popular_music
Brazilian professional football club
original on 17 October 2015. Retrieved 21 July 2015. "São Paulo revela acordo recorde com Penalty por três anos". Yahoo Esportes (in Portuguese). 1 January 2013
São_Paulo_FC
Retrieved 16 April 2026. Pussieldi, Alex (13 May 2022). "Gabriel Bandeira bate recorde mundial dos 100 borboleta no Brasileiro Paralímpico" [Gabriel Bandeira
List of IPC world records in swimming – Men's long course
List_of_IPC_world_records_in_swimming_–_Men's_long_course
Federal capital of Brazil
Retrieved 22 March 2021. Pegorim, Josélia (19 October 2015). "Brasília: novo recorde histórico de calor" [Brasília: new historic heat record]. climatempo.com
Brasília
Retrieved 2 September 2025. "História de Caçador" [Quarta-feira pode ter recorde de temperatura mínima neste ano em Santa Catarina] (in Portuguese). A Notícia
List_of_weather_records
State of Brazil
from the original on 27 January 2024. Retrieved 12 February 2024. "SP tem recorde de estupros e queda histórica de homicídios em 2023". Agência Brasil (in
São_Paulo_(state)
List of goalkeepers who have scored goals
BBC Sport. 28 August 2011. Retrieved 28 August 2011. "Muito antes do recorde de Rogério Ceni veio o gol histórico de Ubirajara". Globoesporte (in Portuguese)
List of goalscoring goalkeepers
List_of_goalscoring_goalkeepers
State of Brazil
original (PDF) on 22 February 2012. Retrieved 6 April 2012. IBGE prevê safra recorde de grãos em 2020 [perfildaindustria.portaldaindustria.com.br/estado/pe
Pernambuco
Brazilian majority state-owned oil and gas corporation
Owed in 24 Months". Bloomberg L.P. 18 November 2015. "Petrobras tem lucro recorde de R$ 188,3 bi e pagará R$ 215,7 bi em dividendos". economia.uol.com.br
Petrobras
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