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  2. Z-order - Wikipedia

    en.wikipedia.org/wiki/Z-order

    z-index only works on elements that have a position value (e.g. position: relative;) and for many coders, this one of the first things to investigate when debugging why the z-index isn't working. [3] Like all other CSS properties, it can be set with JavaScript as well with the following syntax:

  3. Incremental encoder - Wikipedia

    en.wikipedia.org/wiki/Incremental_encoder

    Many incremental encoders have an additional output signal, typically designated index [2] or Z, [3] which indicates the encoder is located at a particular reference position. Also, some encoders provide a status output (typically designated alarm ) [ 4 ] that indicates internal fault conditions such as a bearing failure or sensor malfunction.

  4. Z-order curve - Wikipedia

    en.wikipedia.org/wiki/Z-order_curve

    The Z-ordering can be used to efficiently build a quadtree (2D) or octree (3D) for a set of points. [5] [6] The basic idea is to sort the input set according to Z-order.Once sorted, the points can either be stored in a binary search tree and used directly, which is called a linear quadtree, [7] or they can be used to build a pointer based quadtree.

  5. Earth-centered, Earth-fixed coordinate system - Wikipedia

    en.wikipedia.org/wiki/Earth-centered,_Earth...

    The Earth-centered, Earth-fixed coordinate system (acronym ECEF), also known as the geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its center of mass.

  6. Raising and lowering indices - Wikipedia

    en.wikipedia.org/wiki/Raising_and_lowering_indices

    (where x, y, z are the usual Cartesian coordinates) and the Minkowski metric tensor with metric signature ... So the index-raised contravariant 4-position is: ...

  7. Zero-based numbering - Wikipedia

    en.wikipedia.org/wiki/Zero-based_numbering

    to access the same element, which arguably looks more complicated. Of course, r′ = r + 1, since [z = z′ – 1], [y = y′ – 1], and [x = x′ – 1]. A simple and everyday-life example is positional notation, which the invention of the zero made possible. In positional notation, tens, hundreds, thousands and all other digits start with ...

  8. Settings A-Z - AOL Help

    help.aol.com/settings

    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

  9. Polarization (waves) - Wikipedia

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

    As a function of time t and spatial position z (since for a plane wave in the +z direction the fields have no dependence on x or y) these complex fields can be written as: (,) = [] = [] and (,) = [] = [] (), where λ = λ 0 /n is the wavelength in the medium (whose refractive index is n) and T = 1/f is the period of the wave.