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    Fractal Geometry (1425 words) Essay

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    Fractal Geometry?Fractal Geometry is not just a chapter of mathematics, but one thathelps everyman to see the same old world differently”. – Benoit MandelbrotThe world of mathematics usually tends to be thought of as abstract.

    Complex and imaginary numbers, real numbers, logarithms, functions, some tangible and others imperceivable. But these abstract numbers, simply symbols that conjure an image, a quantity, in our mind, and complex equations, take on a new meaning with fractals – a concrete one. Fractals go from being very simple equations on a piece of paper to colorful, extraordinary images, and most of all, offer an explanation to things. The importance of fractal geometry is that it provides an answer, a comprehension, to nature, the world, and the universe. Fractals occur in swirls of scum on the surface of moving water, the jagged edges of mountains, ferns, tree trunks, and canyons.

    They can be used to model the growth of cities, detail medical procedures and parts of the human body, create amazing computer graphics, and compress digital images. Fractals are about us, and our existence, and they are present in every mathematical law that governs the universe. Thus,fractal geometry can be applied to a diverse palette of subjects in life, and science – the physical, the abstract, and the natural. We were all astounded by the sudden revelation that the output of a very simple, two-line generating formula does not have to be a dry and cold abstraction. When the output was what is now called a fractal, no one called it artificial.

    . . Fractals suddenly broadened the realm in which understanding can be based on a plain physical basis. A fractal is a geometric shape that is complex and detailed at every level of magnification, as well as self-similar. Self-similarity is something looking the same over all ranges of scale, meaning a small portion of a fractal can be viewed as a microcosm of the larger fractal.

    One of the simplest examples of a fractal is the snowflake. It is constructed by taking an equilateral triangle, and after many iterations of adding smaller triangles to increasingly smaller sizes, resulting ina “snowflake” pattern, sometimes called the von Koch snowflake. The theoretical result of multiple iterations is the creation of a finite area with an infinite perimeter, meaning the dimension is incomprehensible. Fractals, before that word was coined, were simply considered above mathematical understanding, until experiments were done in the 1970’s by Benoit Mandelbrot, the “father of fractal geometry”.

    Mandelbrot developed a method that treated fractals as a part ofstandard Euclidean geometry, with the dimension of a fractal being an exponent. Fractals pack an infinity into “a grain of sand”. This infinity appears when one tries to measure them. The resolution lies in regarding them as falling between dimensions. The dimension of a fractal in general is not a whole number, not an integer. So a fractal curve, a one-dimensional object in a plane which has two-dimensions, has a fractal dimension that lies between 1 and 2.

    Likewise, a fractal surface has a dimension between 2 and 3. The value depends on how the fractal is constructed. The closer the dimension of a fractal is to its possible upper limit which is the dimension of the space in which it is embedded, the rougher, the more filling of that space it is. Fractal Dimensions are an attempt to measure, or define the pattern, in fractals. A zero-dimensional universe is one point.

    A one-dimensional universe is a single line, extending infinitely. A two-dimensional universe is a plane, a flat surface extending in all directions, and athree-dimensional universe, such as ours, extends in all directions. All of these dimensions are defined by a whole number. What, then, would a 2. 5 or 3.

    2 dimensional universe look like? This is answered by fractal geometry, the word fractal coming from the concept of fractionaldimensions. A fractal lying in a plane has a dimension between 1 and 2. The closer the number is to 2, say 1. 9, the more space it would fill. Three-dimensional fractal mountains can be generated using a random number sequence, and those with a dimension of 2.

    9 (very close to theupper limit of 3) are incredibly jagged. Fractal mountains with a dimension of 2. 5 are less jagged, and a dimension of 2. 2 presents a model of about what is found in nature.

    The spread in spatial frequency of a landscape is directly related to it’s fractal dimension. Some of the best applications of fractals in modern technology are digital image compression and virtual reality rendering. First of all, the beauty of fractals makes them a key element in computer graphics, adding flare to simple text, and texture to plain backgrounds. In 1987 a mathematician named Michael F. Barnsley created a computer program called the Fractal Transform, which detected fractal codes in real-world images, such as pictures which havebeen scanned and converted into a digital format. This spawned fractal image compression, which is used in a plethora of computer applications, especially in the areas of video, virtual reality, and graphics.

    The basic nature of fractals is what makes them so useful. If someone wasrendering a virtual reality environment, each leaf on every tree and every rock on every mountain would have to be stored. Instead, a simple equation can be used to generate any level of detail needed. A complex landscape can be stored in the form of a few equations in less than 1kilobyte, 1/1440 of a 3.

    25″ disk, as opposed to the same landscape being stored as 2. 5 megabytes of image data (almost 2 full 3. 25″ disks). Fractal image compression is a major factor for making the “multimedia revolution” of the 1990’s take place. Another use for fractals is in mapping the shapes of cities and their growth.

    Researchers have begun to examine the possibility of using mathematical forms called fractals to capture the irregular shapes of developing cities. Such efforts may eventually lead to models that would enable urban architects to improve the reliability of types of branched or irregular structures. . .

    The fractal mapping of cities comes from the concept of self-similarity. The number of cities and towns, obviously a city being larger and a town being smaller, can be linked. For a given area there are a few large settlements, and many more smaller ones, such as towns and villages. This could be represented in a pattern such as 1 city, to 2 smaller cities, 4 smaller towns, 8 still smaller villages – a definite pattern, based on common sense.

    To develop fractal models that could be applied to urban development, Barnsley and his collaborators turned to techniques first used in statistical physics to describe the agglomeration of randomly wandering particles in two-dimensional clusters. . . ‘Our view about the shape and form of cities is that their irregularity and messiness are simply a superficial manifestation of a deeper order’. Thus, fractals are used again to try to find a pattern in visible chaos.

    Using a process called “correlated percolation”, very accurate representations of city growth can be achieved. The best successes with the fractal city researchers have been Berlin and London, where a very exact mathematical relationship that included exponential equations was able to closely model the actual city growth. The end theory is that central planning has only a limited effect on cities – that people will continue to live where they want to, as if drawn there naturally – fractally. There has been a struggle since the beginning of his existence to find the meaning of life.

    Usually, it was answered with religion, and a “god”. Fractals are a sort of god of the universe, and prove that we do live in a very mathematical world. But, fractals, from their definition of complex natural patterns to models of growth, seem to be proving that we are in a finite, definable universe, and that is why fractals are not only about mathematics, but about seemingly about humans.

    This essay was written by a fellow student. You may use it as a guide or sample for writing your own paper, but remember to cite it correctly. Don’t submit it as your own as it will be considered plagiarism.

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