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  2. Back-of-the-envelope calculation - Wikipedia

    en.wikipedia.org/wiki/Back-of-the-envelope...

    Upon hearing that the S-IV 2nd Stage of the Saturn I would need transport from California to Florida for launch as part of the Apollo program, Jack Conroy sketched the cavernous cargo airplane, the Pregnant Guppy. [16] The Video Toaster was designed on placemats in a Topeka pizza restaurant. [17]

  3. Quadratic equation - Wikipedia

    en.wikipedia.org/wiki/Quadratic_equation

    Figure 1. Plots of quadratic function y = ax 2 + bx + c, varying each coefficient separately while the other coefficients are fixed (at values a = 1, b = 0, c = 0). A quadratic equation whose coefficients are real numbers can have either zero, one, or two distinct real-valued solutions, also called roots.

  4. United States Academic Decathlon - Wikipedia

    en.wikipedia.org/wiki/United_States_Academic...

    Use of this format was continued for the Science packet in the 2012–2013 season. [27] The events are split up into two groups: the seven objective tests (art, economics, language and literature, math, music, science and social science) the three subjective events (essay, interview and speech). In addition, there is a Super Quiz relay event.

  5. Second-order arithmetic - Wikipedia

    en.wikipedia.org/wiki/Second-order_arithmetic

    A subsystem of second-order arithmetic is a theory in the language of second-order arithmetic each axiom of which is a theorem of full second-order arithmetic (Z 2). Such subsystems are essential to reverse mathematics , a research program investigating how much of classical mathematics can be derived in certain weak subsystems of varying strength.

  6. Wave packet - Wikipedia

    en.wikipedia.org/wiki/Wave_packet

    This linear growth is a reflection of the (time-invariant) momentum uncertainty: the wave packet is confined to a narrow Δx = √ a/2, and so has a momentum which is uncertain (according to the uncertainty principle) by the amount ħ/ √ 2a, a spread in velocity of ħ/m √ 2a, and thus in the future position by ħt /m √ 2a. The uncertainty ...

  7. Second-order - Wikipedia

    en.wikipedia.org/wiki/Second-order

    Second order approximation, an approximation that includes quadratic terms; Second-order arithmetic, an axiomatization allowing quantification of sets of numbers; Second-order differential equation, a differential equation in which the highest derivative is the second; Second-order logic, an extension of predicate logic

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