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  2. Einstein's thought experiments - Wikipedia

    en.wikipedia.org/wiki/Einstein's_thought_experiments

    In the accompanying illustration, A represents a circular disk of 10 units diameter at rest in an inertial reference frame. The circumference of the disk is times the diameter, and the illustration shows 31.4 rulers laid out along the circumference. B represents a circular disk of 10 units diameter that is spinning rapidly. According to a non ...

  3. Proplyd 114-426 - Wikipedia

    en.wikipedia.org/wiki/Proplyd_114-426

    The disk was imaged with ALMA and the disk mass was estimated to be 3.38 ±0.56 M J. [8] The disk is quite faint at longer wavelengths despite being a large disk. This is explained by the disk being an evolved disk with large particles of solids and ices. The disk is seen in dust continuum emission and absorption in the carbon monoxide band ...

  4. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

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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!

  6. Auxiliary normed space - Wikipedia

    en.wikipedia.org/wiki/Auxiliary_normed_space

    A sequentially complete bounded disk in a Hausdorff TVS is a Banach disk. [5] Any disk in a Hausdorff TVS that is complete and bounded (e.g. compact) is a Banach disk. [8] The closed unit ball in a Fréchet space is sequentially complete and thus a Banach disk. [5] Suppose that is a bounded disk in a TVS .

  7. Optical disc - Wikipedia

    en.wikipedia.org/wiki/Optical_disc

    The data are stored on the disc with a laser or stamping machine, and can be accessed when the data path is illuminated with a laser diode in an optical disc drive that spins the disc at speeds of about 200 to 4,000 RPM or more, depending on the drive type, disc format, and the distance of the read head from the center of the disc (outer tracks ...

  8. Floppy disk - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk

    8-inch floppy disk, inserted in drive, (3½-inch floppy diskette, in front, shown for scale) 3½-inch, high-density floppy diskettes with adhesive labels affixed The first commercial floppy disks, developed in the late 1960s, were 8 inches (203.2 mm) in diameter; [4] [5] they became commercially available in 1971 as a component of IBM products and both drives and disks were then sold ...

  9. Promoting Healthy Choices: Information vs. Convenience - HuffPost

    images.huffingtonpost.com/2012-12-21-promoting...

    freedom of choice. These interventions acknowledge the presence of self control problems, as well as other irrational influences on consumer decision making, and exploit already existing cognitive biases to promote better behaviors. This approach has been advocated by scholars in behavioral and health economics as a