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  2. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  3. William Jones (mathematician) - Wikipedia

    en.wikipedia.org/wiki/William_Jones_(mathematician)

    William Jones, FRS (1675 – 1 July 1749 [1]) was a Welsh mathematician best known for his use of the symbol π (the Greek letter Pi) to represent the ratio of the circumference of a circle to its diameter. He was a close friend of Sir Isaac Newton and Sir Edmund Halley.

  4. Pi Day - Wikipedia

    en.wikipedia.org/wiki/Pi_Day

    Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of π , and was first celebrated in the United States.

  5. Euler's identity - Wikipedia

    en.wikipedia.org/wiki/Euler's_identity

    is pi, the ratio of the circumference of a circle to its diameter. Euler's identity is named after the Swiss mathematician Leonhard Euler . It is a special case of Euler's formula e i x = cos ⁡ x + i sin ⁡ x {\displaystyle e^{ix}=\cos x+i\sin x} when evaluated for x = π {\displaystyle x=\pi } .

  6. Proof that π is irrational - Wikipedia

    en.wikipedia.org/wiki/Proof_that_π_is_irrational

    In the 1760s, Johann Heinrich Lambert was the first to prove that the number π is irrational, meaning it cannot be expressed as a fraction /, where and are both integers. ...

  7. Pi Day: Why some mathematicians refuse to celebrate 14 ... - AOL

    www.aol.com/news/pi-day-why-mathematicians...

    America’s national day of celebration is great for desserts, but doesn’t really make any sense to people outside of the United States

  8. Transcendental number - Wikipedia

    en.wikipedia.org/wiki/Transcendental_number

    The name "transcendental" comes from Latin trānscendere 'to climb over or beyond, surmount', [7] and was first used for the mathematical concept in Leibniz's 1682 paper in which he proved that sin x is not an algebraic function of x. [8]

  9. What is Pi Day? The story of why some celebrate March 14 ...

    www.aol.com/pi-day-story-why-celebrate-151344923...

    America’s national day of celebration is great for desserts, but doesn’t really make any sense to people outside of the United States