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  2. The best coupon apps and how to use them - AOL

    www.aol.com/finance/best-coupon-apps-them...

    Whether you’re shopping in-store or online, coupon apps can help you save without the hassle of clipping physical coupons. Here’s a comprehensive look at the best coupon apps available today ...

  3. PromotionCode.org - Wikipedia

    en.wikipedia.org/wiki/PromotionCode.org

    PromotionCode.org is a free resource for online shoppers and maintains affiliate partnerships with major retailers such as Target, Wal-Mart, HP and Verizon.The site both originates and disseminates print coupons and online promotion codes.

  4. Delta (science magazine) - Wikipedia

    en.wikipedia.org/wiki/Delta_(science_magazine)

    Delta is a monthly, popular science magazine published by the University of Warsaw in cooperation with: . The Polish Mathematical Society,; The Polish Physical Society,; The Polish Astronomical Society, [4]

  5. Delta operator - Wikipedia

    en.wikipedia.org/wiki/Delta_operator

    The forward difference operator () = (+) ()is a delta operator. Differentiation with respect to x, written as D, is also a delta operator.; Any operator of the form = (where D n (ƒ) = ƒ (n) is the n th derivative) with is a delta operator.

  6. RetailMeNot - Wikipedia

    en.wikipedia.org/wiki/RetailMeNot

    RetailMeNot.com, a digital coupon site in the United States [3] eConversions, the parent company of Gutschein-Codes.de in Germany and VoucherCodes, a voucher code site in the United Kingdom [19] [20] Ma-Reduc.com and Poulpeo.com, digital coupon and cash back sites in France [21] ZenDeals.com, a North American coupon site (October 9, 2013) [22]

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    An alternative statement is: given n coupons, how many coupons do you expect you need to draw with replacement before having drawn each coupon at least once? The mathematical analysis of the problem reveals that the expected number of trials needed grows as Θ ( n log ⁡ ( n ) ) {\displaystyle \Theta (n\log(n))} .

  9. Delta method - Wikipedia

    en.wikipedia.org/wiki/Delta_method

    Demonstration of this result is fairly straightforward under the assumption that () is differentiable near the neighborhood of and ′ is continuous at with ′ ().To begin, we use the mean value theorem (i.e.: the first order approximation of a Taylor series using Taylor's theorem):