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  2. John Wallis - Wikipedia

    en.wikipedia.org/wiki/John_Wallis

    Wallis' development of a model of English grammar, independent of earlier models based on Latin grammar, is a case in point of the way other sciences helped develop cryptology in his view. [37] Wallis tried to teach his own son John, and his grandson by his daughter Anne, William Blencowe the tricks of the trade.

  3. Wallis' integrals - Wikipedia

    en.wikipedia.org/wiki/Wallis'_integrals

    By means of integration by parts, a reduction formula can be obtained. Using the identity ⁡ = ⁡, we have for all , ⁡ = (⁡) (⁡) = ⁡ ⁡ ⁡. Integrating the second integral by parts, with:

  4. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Believed to be the first coupon ever, this ticket for a free glass of Coca-Cola was first distributed in 1888 to help promote the drink. By 1913, the company had redeemed 8.5 million tickets. [6] Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. [6] [7] Coupons were mailed to potential customers and placed in magazines ...

  5. Wallis product - Wikipedia

    en.wikipedia.org/wiki/Wallis_product

    Comparison of the convergence of the Wallis product (purple asterisks) and several historical infinite series for π. S n is the approximation after taking n terms. Each subsequent subplot magnifies the shaded area horizontally by 10 times.

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