linear operator

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$Koch snowflakeSwedish mathematician Niels von Koch published the fractal that bears his name in 1906. It begins with an equilateral triangle; three new equilateral triangles are constructed on each of its sides using the middle thirds as the bases, which are then removed to form a six-pointed star. This is continued in an infinite iterative process, so that the resulting curve has infinite length. The Koch snowflake is noteworthy in that it is continuous but nowhere differentiable; that is, at no point on the curve does there exist a tangent line.$
In Niels Fabian Helge von Koch
…part of the theory of linear operators, which are fundamental in the study of quantum mechanics. He also worked on the Riemann hypothesis (see Riemann zeta function) and the prime number theorem.
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