en.wikipedia.org/wiki/John_Wallis

John Wallis (3 December 1616 – 8 November 1703) was an English
mathematician who is given partial credit for the development of infinitesimal
calculus. Between 1643 and 1689 he served as chief...

www.britannica.com/biography/John-Wallis

Jul 20, 1998 ... Wallis' appointment in 1649 as Savilian professor of geometry at the University of
Oxford ... thus he did not follow Cavalieri's geometric approach and instead
assigned ... He invented and introduced the symbol ∞ for infinity.

www.emma.cam.ac.uk/about/history/famous/?id=7

Mathematician who developed calculus and who introduced the symbol for '
infinity', ∞. John Wallis, 'the greatest of Newton's precursors in mathematics', did
not ...

www.famous-mathematicians.com/john-wallis/

John Wallis was an English mathematician born on 23rd October 1616 in ... such
as introducing the term 'continued fraction' and using the symbol for infinity for ...

www.newworldencyclopedia.org/entry/John_Wallis

Oct 5, 2011 ... He is also credited with introducing the symbol ∞ for infinity. .... He states, but
does not prove, the corresponding result for a curve of the form y ...

www-history.mcs.st-and.ac.uk/Biographies/Wallis.html

Biography of John Wallis (1616-1703) ... schools of the time, so Wallis did not
come in contact with that topic at school. .... He studied the works of Kepler,
Cavalieri, Roberval, Torricelli and Descartes, and then introduced ideas of the
calculus ... He used the symbol again in the more influential work Arithmetica
infinitorum ....

mathcentral.uregina.ca/qq/database/qq.09.98/kelly1.html

Does it have a name? ... (Infinity is in the calculus section.) ... Cajori says that the
infinity symbol was introduced by John Wallis (1616-1703) in 1655 in his De ...

www.math.tamu.edu/~dallen/history/infinity.pdf

Curiously, the prospect of time having no beginning did not perplex the. Greeks
.... In 1657 Wallis gives the symbol, ... also introduced fractional power notation.

www.crystalinks.com/infinity.html

John Wallis is credited with introducing the symbol in 1655 in his De sectionibus
... This point of view does not mean that infinity cannot be used in physics.

www.maths.tcd.ie/pub/HistMath/People/Wallis/RouseBall/RB_Wallis.html

They are notable partly for the introduction of the use of infinite series as an ...
work did something to make the method intelligible to all mathematicians: it is the
...