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Dilation (usually represented by ⊕) is one of the basic operations in mathematical morphology. Originally developed for binary images, it has been expanded first to grayscale images, and then to complete lattices. The dilation operation usually uses a structuring element for probing and expanding the shapes contained in the input image.
[1] In Euclidean space, such a dilation is a similarity of the space. [2] Dilations change the size but not the shape of an object or figure. Every dilation of a Euclidean space that is not a congruence has a unique fixed point [3] that is called the center of dilation. [4] Some congruences have fixed points and others do not. [5]
Cervical dilation, the widening of the cervix in childbirth, miscarriage etc. Coronary dilation, or coronary reflex; Dilation and curettage, the opening of the cervix and surgical removal of the contents of the uterus; Dilation and evacuation, the dilation of the cervix and evacuation of the contents of the uterus
In geometry of the Euclidean plane, the 3-4-3-12 tiling is one of 20 2-uniform tilings of the Euclidean plane by regular polygons, containing regular triangles, squares, and dodecagons, arranged in two vertex configuration: 3.4.3.12 and 3.12.12. [1] [2] [3] [4]
The first four partial sums of the series 1 + 2 + 3 + 4 + ⋯.The parabola is their smoothed asymptote; its y-intercept is −1/12. [1]The infinite series whose terms ...
The notation is cyclic and therefore is equivalent with different starting points, so 3.5.3.5 is the same as 5.3.5.3. The order is important, so 3.3.5.5 is different from 3.5.3.5 (the first has two triangles followed by two pentagons). Repeated elements can be collected as exponents so this example is also represented as (3.5) 2.
For instance 1 ⁄ 5 can be generated with three folds; first halve a side, then use Haga's theorem twice to produce first 2 ⁄ 3 and then 1 ⁄ 5. The accompanying diagram shows Haga's first theorem: = +. The function changing the length AP to QC is self inverse.
For instance, the third one is formed from outlines comprising 1, 5 and 10 dots, but the 1, and 3 of the 5, coincide with 3 of the 10 – leaving 12 distinct dots, 10 in the form of a pentagon, and 2 inside. p n is given by the formula: = = + for n ≥ 1. The first few pentagonal numbers are: