A GLIMPSE ON FRACTAL GEOMETRY YUAN JIANG Department of Applied Math Oct9, 2012.

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Presentation transcript:

A GLIMPSE ON FRACTAL GEOMETRY YUAN JIANG Department of Applied Math Oct9, 2012

Brief Basic picture about Fractal Geometry Illustration with patterns, graphs Applications(fractal dimensions, etc.) Examples with intuition(beyond maths) Three problems related, doable for us

0. History Mandelbrot(November 1924 ~ October 2010), Father of the Fractal Geometry. For his Curriculum Vitae, c.f. VitaOnePage.doc VitaOnePage.doc

1.1 Definition Fractal Geometry----- concerned with irregular patterns made of parts that are in some way similar to the whole, called self-similarity.self-similarity

1.2 Illustration

2.1 What’s behind the curve? Geometric properties---- lengths/areas/volumes/… Space descriptions---- dimensions(in what sense?)/…

2.2 Fractal dimensions Dimension in various sense ----concrete sense ----parameterized sense ----topological sense ----…… Fractal dimensions (for regular fractal stuffs) Hausdorff Dimension ‘MEASURING & ZOOMING’ (See the Whiteboard)

2.3 Formula of fractal dimension (for regular fractal geometry) Let k be the unit size of our measurement (e.g. k=1cm for a line), with the method of continuously covering the figure; let N(k) be the # of units with such a measurement method. Then, the Hausdorff dimension of fractal geometry is defined as D=lnN(k)/ln(1/k)

2.4 Fractal Dimensions(examples) Sierpinski Curtain (2-D) D=ln3/ln2=1.585 Menger Sponge (3-D) D=ln20/ln3=2.777  Koch Snowflake (1-D) D=ln4/ln3=1.262

3.1 Applications in Coastline Approximation Think about coastlines, and what’s the dimension? 1? 2? Or some number in between? (See Whiteboard) Notice: it’s no longer regular.

3.2 Applications (miscellaneous)

4. Three “exotic” problems in math Construct a function on real number that is continuous yet non-derivable everywhere. Construct a figure with bounded area yet infinite circumference, say in a paper plane. Construct a set with zero measure yet (uncountably) infinite many points.

5. References The Fractal Geometry of Nature, Mandelbrot (1982); Fractal Geometry as Design Aid, Carl Bovill (2000); Applications of Fractal Geometry to the Player Piano Music of Conlon Nancarrow, Julie Scrivener; Principles of Mathematical Analysis, Rudin (3 rd edition); ort.html; (Brownian Motion and Fractal Geometry) ort.html development-fractal/; (Fractal and Life, leisure taste ) development-fractal/ (Mr. Mandelbrot)