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  2. Tax - Wikipedia

    en.wikipedia.org/wiki/Tax

    The change from progressive local taxation based on property values to a single-rate form of taxation regardless of ability to pay (the Community Charge, but more popularly referred to as the Poll Tax), led to widespread refusal to pay and to incidents of civil unrest, known colloquially as the 'Poll Tax Riots'.

  3. 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.

  4. Isaac Newton - Wikipedia

    en.wikipedia.org/wiki/Isaac_Newton

    He further initiated the field of calculus of variations, [24] and devised an early form of regression analysis. [ 25 ] Newton was a fellow of Trinity College and the second Lucasian Professor of Mathematics at the University of Cambridge ; he was appointed at the age of 26.