Did you know that some important math symbols Equals and Pi hail from Cymru?

To begin, the equals sign ( = ) was invented by none other than Robert Recorde (1510-1558), a Welsh physician and mathematician from Dinbych-y-pysgod Sir Benfro (Tenby, Pembrokeshire). In addition (pun absolutely intended) to inventing the = sign, he also introduced the already invented plus (+) and minus (-) signs to the English speaking world.

Additionally…

Meet William Jones (1675-1749), a Welsh mathematician whose pioneering work left a mark on the world of mathematics and introduced a symbol that has become synonymous with the field: π.

Born in the small village of Llanfihangel Tre’r Beirdd, Ynys Môn in 1675, William Jones exhibited an early aptitude for mathematics and showed promise as a scholar.

Jones made significant contributions to mathematics, particularly in the realm of trigonometry. He introduced the use of π (pi) as a symbol for the mathematical constant representing the ratio of a circle’s circumference to its diameter.

Jones’ use of π as the symbol for pi was adopted by Swiss mathematician Leonhard Euler in the 18th century. It has since become universally recognised and is essential in various mathematical and scientific disciplines.

Jones’ work laid the foundation for a deeper understanding of trigonometry and the principles that underpin it. His contributions revolutionised mathematical notation and paved the way for countless mathematical discoveries.

William Jones is celebrated not only for his contributions to mathematics but also for introducing one of the most iconic and universally recognised symbols in the field.

Pi (π) is an essential constant used to calculate the circumference, area, and volume of circles and spheres, making it a cornerstone in geometry and mathematical analysis.

March 14th (3/14) is celebrated as Pi Day around the world, honouring the mathematical constant π. It’s a day for math enthusiasts (yes, they do exist) to revel in the significance of pi.

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Sally George

Sally is a proud wife of a Welshman, editor & writer of Welsh Histories. She’s all about stories—that shout ‘anything Welsh.’ Drop her an email if you have an advice, insight, experience, or a story to share.