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  2. AOL Mail

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    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!

  3. Freepost - Wikipedia

    en.wikipedia.org/wiki/Freepost

    The address on the envelope, postcard, or label is the same as the address for regular mail, except that the ZIP+4 code is different. In some large cities, business reply mail has its own five-digit ZIP code or codes (e.g., 20077 and 20078 in Washington, D.C.). The envelope or postcard also includes space for the business reply permit number.

  4. Envelope (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(mathematics)

    In geometry, an envelope of a planar family of curves is a curve that is tangent to each member of the family at some point, and these points of tangency together form the whole envelope. Classically, a point on the envelope can be thought of as the intersection of two " infinitesimally adjacent" curves, meaning the limit of intersections of ...

  5. Envelope (waves) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(waves)

    In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. [1] The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope. The envelope function may be a ...

  6. Stamped envelope - Wikipedia

    en.wikipedia.org/wiki/Stamped_envelope

    The H&G catalog, as it is known, describes stamped envelopes by the envelope size, the depicted indicia and its valuations, some corner cards, while sometimes disregarding envelope color. The Scott catalogue is the United States envelope color and value of the indicia which is perfect for dealing with cut squares , but falls short of ...

  7. Product sample - Wikipedia

    en.wikipedia.org/wiki/Product_sample

    Free sample of Peter Pan peanut butter, promising it "does not stick to the roof of your mouth" A product sample is a sample of a consumer product that is given to the consumer free of cost so that they may try a product before committing to a purchase. When it comes to marketing non-durable commodities, such as food items, sampling is crucial.

  8. Sinc function - Wikipedia

    en.wikipedia.org/wiki/Sinc_function

    The sinc function as audio, at 2000 Hz (±1.5 seconds around zero) In mathematics, the historical unnormalized sinc function is defined for x ≠ 0 by ⁡ = ⁡.. Alternatively, the unnormalized sinc function is often called the sampling function, indicated as Sa(x).

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