- Free Sad Girl Wallpaper Download For Mobile Iphone
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Wallpaper (also desktop picture and desktop background) is an image used as a background of a graphical user interface on a computer screen or mobile communications device. On a computer it is usually for the desktop, while for a mobile phone it is usually the background for the 'home' or 'idle' screen. Though most devices comes with a default picture, users can usually change it to files of their choosing.[1]
'Wallpaper' is the term used in Microsoft Windows before Windows Vista (where it is called the Desktop 'Background'), while Mac OS X calls it a 'desktop picture' (previously, the term desktop pattern was used to refer to a small pattern that was repeated to fill the screen).
A wallpaper group (or plane symmetry group or plane crystallographic group) is a mathematical classification of a two-dimensional repetitive pattern, based on the symmetries in the pattern. Such patterns occur frequently in architecture and decorative art. There are 17 possible distinct groups.Wallpaper groups are two-dimensional symmetry groups, intermediate in complexity between the simpler frieze groups and the three-dimensional crystallographic groups (also called space groups).
Wallpaper groups categorize patterns by their symmetries. Subtle differences may place similar patterns in different groups, while patterns that are very different in style, color, scale or orientation may belong to the same group.
Consider the following examples:
Example A: Cloth, Tahiti
Example B: Ornamental painting, Nineveh, Assyria
Example C: Painted porcelain, China
Examples A and B have the same wallpaper group; it is called p4m in the IUC notation and *442 in the orbifold notation. Example C has a different wallpaper group, called p4g or 4*2 . The fact that A and B have the same wallpaper group means that they have the same symmetries, regardless of details of the designs, whereas C has a different set of symmetries despite any superficial similarities.
A complete list of all seventeen possible wallpaper groups can be found below.
Symmetries of patterns [edit]
A symmetry of a pattern is, loosely speaking, a way of transforming the pattern so that the pattern looks exactly the same after the transformation. For example, translational symmetry is present when the pattern can be translated (shifted) some finite distance and appear unchanged. Think of shifting a set of vertical stripes horizontally by one stripe. The pattern is unchanged. Strictly speaking, a true symmetry only exists in patterns that repeat exactly and continue indefinitely. A set of only, say, five stripes does not have translational symmetry — when shifted, the stripe on one end 'disappears' and a new stripe is 'added' at the other end. In practice, however, classification is applied to finite patterns, and small imperfections may be ignored.
Sometimes two categorizations are meaningful, one based on shapes alone and one also including colors. When colors are ignored there may be more symmetry. In black and white there are also 17 wallpaper groups; e.g., a colored tiling is equivalent with one in black and white with the colors coded radially in a circularly symmetric 'bar code' in the centre of mass of each tile.
The types of transformations that are relevant here are called Euclidean plane isometries. For example:
If we shift example B one unit to the right, so that each square covers the square that was originally adjacent to it, then the resulting pattern is exactly the same as the pattern we started with. This type of symmetry is called a translation. Examples A and C are similar, except that the smallest possible shifts are in diagonal directions.
If we turn example B clockwise by 90°, around the centre of one of the squares, again we obtain exactly the same pattern. This is called a rotation. Examples A and C also have 90° rotations, although it requires a little more ingenuity to find the correct centre of rotation for C.
We can also flip example B across a horizontal axis that runs across the middle of the image. This is called a reflection. Example B also has reflections across a vertical axis, and across two diagonal axes. The same can be said for A.
![Mobile Mobile](/uploads/1/2/4/9/124904931/895023650.jpg)
However, example C is different. It only has reflections in horizontal and vertical directions, not across diagonal axes. If we flip across a diagonal line, we do not get the same pattern back; what we do get is the original pattern shifted across by a certain distance. This is part of the reason that the wallpaper group of A and B is different from the wallpaper group of C.
History [edit]
A proof that there were only 17 possible patterns was first carried out by Evgraf Fedorov in 1891[1] and then derived independently by George P贸lya in 1924.[2][3]
Free Sad Girl Wallpaper Download For Mobile Iphone
Free Sad Girl Wallpaper Download For Mobile Computer
You can use this wallpaper for your device. This Sad, Girl, Desktop, Background, HD, Wallpaper, Widescreen, Pictures, Free, Download, Best Backgrounds, Windows Wallpaper, Display, 1680x1050 is published in Others category and the original resolution of wallpaper is 1680x1050 px. Sad, Girl, Desktop, Background, HD, Wallpaper, Widescreen, Pictures, Free, Download, Best Backgrounds, Windows Wallpaper, Display, 1680x1050 There are too many resolution options at the resolution section above. You can choose whatever you need from the list. The system will be prepared your choose and download will be start immediately. All of these, if you need only original size of image, than you can click 'Download' button below of the preview image. This free image was published since Posted on .
What is Wallpaper?
We mention it for primary display screen of a graphical user interface. Wallpapers are an image that is used as a backdrop for any graphical user interfaces which one has a desktop. Generally you see the wallpapers on the screen after your device is run.
Typically, a wallpaper image may be centered, stretched, or tiled. When an image is centered, it is placed in the middle of the desktop and is surrounded by a solid color. When an image is stretched, it is stretched to cover all of the desktop. Only certain images can be stretched or they look distorted. An image that is tiled is placed on the desktop much like tiles are placed in a shower or a tiled floor. Tiling is commonly used for patterns instead of photos because a pattern is one square image that repeats itself across and down the screen, effectively forming a single image.
The image of Sad, Girl, Desktop, Background, HD, Wallpaper, Widescreen, Pictures, Free, Download, Best Backgrounds, Windows Wallpaper, Display, 1680x1050 is published by users. If you want to report any violation for this image you can reach us by clicking here.
What is Wallpaper?
We mention it for primary display screen of a graphical user interface. Wallpapers are an image that is used as a backdrop for any graphical user interfaces which one has a desktop. Generally you see the wallpapers on the screen after your device is run.
Typically, a wallpaper image may be centered, stretched, or tiled. When an image is centered, it is placed in the middle of the desktop and is surrounded by a solid color. When an image is stretched, it is stretched to cover all of the desktop. Only certain images can be stretched or they look distorted. An image that is tiled is placed on the desktop much like tiles are placed in a shower or a tiled floor. Tiling is commonly used for patterns instead of photos because a pattern is one square image that repeats itself across and down the screen, effectively forming a single image.
The image of Sad, Girl, Desktop, Background, HD, Wallpaper, Widescreen, Pictures, Free, Download, Best Backgrounds, Windows Wallpaper, Display, 1680x1050 is published by users. If you want to report any violation for this image you can reach us by clicking here.
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