[DOC] [TLE] Robert Recorde [PAR] Robert Recorde. 1510 - 1558. Robert Recorde was born in Tenby, Wales in 1510
. ... in medicine, mathematics is the area that has brought about his name in 
history. ... the most important arithmetic textbook written in English in the 16th 
century. ... He used two, long, parallel lines because he said, "noe 2 thynges can 
be... [DOC] [TLE] The equals of Robert Recorde [PAR] We previously knew little of the 16th Century mathematician, but twice had ... It 
was followed by Recorde's 1551 textbook on geometry (in which he first used the 
... Recorde simply adopted the symbol of parallel lines as a metaphor, ... the 
same manipulations on the two expressions, the resulting numbers must still be 
equal. [DOC] [TLE] Robert Recorde - Wikipedia [PAR] Robert Recorde (ca. 15121558) was a Welsh physician and mathematician. He 
invented the "equals" sign (=) and also introduced the pre-existing "plus" sign (+) 
to English speakers in 1557. Contents. [hide]. 1 Biography; 2 Publications; 3 See 
also; 4 Notes; 5 References; 6 External ... to Knowledge, containing the First 
Principles of Geometry ... bothe for the use... [DOC] [TLE] The invention of the equals sign [PAR] It was the invention of a Welshman named Robert Recorde, the man who first ... 
Recorde used the symbol, composed of two parallel lines, in his 1557 book ... (
Source: http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Recorde.
html)... [DOC] [TLE] The equal sign - more trouble than it's worth? - Interactive Mathematics [PAR] Aug 25, 2010 ... ... was invented by a man from Wales, Robert Recorde in the mid-16th century. 
He used equal-length parallel lines because "nothing could be more equal". 
Before the invention of the "=" symbol, mathematicians employed ... For example, 
the set {1,2,3} is equivalent to the set {a,b,c} since they both have the... [DOC] [TLE] BBC - Wales History: Robert Recorde - the man who invented the ... [PAR] Jun 3, 2010 ... We've all used them, countless times, in maths lessons, in the bank, ... to make 
his way to Oxford where he began a course of studies in mathematics. ... Unlike 
our modern version, Recorde's equals sign consisted of two long parallel lines 
that could, .... 12th century  14th century  15th century  16th century... [DOC] [TLE] Welsh History Month: Robert Recorde - the man who gave us the ... [PAR] Oct 7, 2015 ... Mathematician Robert Recorde, who was originally from Tenby ... nothing in his 
opinion could be more equal than two parallel lines of the same length. ... of 
action in the mid-16th century and was to prove Recorde's undoing;... [DOC] [TLE] Notation, notation, notation: a brief history of mathematical symbols ... [PAR] May 21, 2014 ... When the conversation turned to the origins of math symbols, I was ... those two 
parallel lines  was not used in print before 1575, when the Welsh mathematician 
and physician Robert Recorde ... And from time to time, pre-16th century writers 
of mathematical texts had ventured into symbolic expression. [DOC] [TLE] A brief history of mathematical symbols | Announce | University of ... [PAR] The author of Enlightening Symbols: A Short History of Mathematical ... knew that 
almost all maths was written rhetorically before the 16th century, ... Even our 
wonderful symbol for equality  you know, those two parallel lines  was not used 
in print before 1575, when the Welsh mathematician and physician Robert 
Recorde... [DOC] [TLE] Welsh History Month: Some kind of Recorde...polymath, physician ... [PAR] Oct 30, 2015 ... While his invention secured Recorde's place in history there was much ... of 
people use something that owes its invention to a 16th-century Welshman. ... It = 
the equals sign, and its creator was the Tenby-born polymath Robert Recorde. .... 
Recorde chose two parallel lines since, as he put it himself noe 2... [DOC] [TLE] Geometry.Net - Scientists: Recorde

Question: It was 16th C. mathematician Robert Recorde who first used 2 parallel lines as this
Answer: equal sign