Here is a new series of pictures featuring my favorite vintage slate blackboard – graphs of different mathematical functions. I am also using a more high-tech setup – a digital tablet.
The new gallery in my stock photography portfolio includes simple trigonometrical functions like a sinusoid, parabola, Gaussian curve, exponential and limited growth curves, and more complicated graphs of parametric functions: butterfly curve and Lissajous curves.
The butterfly curve is a transcendental plane curve discovered by Temple H. Fay. It based on sine functions.
A Lissajous curve, also known as Lissajous figure or Bowditch curve is the graph of a system of parametric equations including sine functions. This family of curves which describe complex harmonic motion was investigated by Nathaniel Bowditch in 1815, and later in more detail by Jules Antoine Lissajous in 1857.
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