We can use this theorem to compute the Hausdorff dimension of the Sierpinski triangle (or sometimes called Sierpinski gasket). Consider three non-collinear points a<sub>1</sub>, a<sub>2</sub>, a<sub>3</sub> in the plane R<sup>2</sup> and let ψ<sub>i</sub> be the dilation of ratio 1/2 around a<sub>i</sub>. The unique non-empty fixed point of the corresponding mapping ψ is a Sierpinski gasket and the dimension s is the unique solution of | We can use this theorem to compute the Hausdorff dimension of the Sierpinski triangle (or sometimes called Sierpinski gasket). Consider three non-collinear points a<sub>1</sub>, a<sub>2</sub>, a<sub>3</sub> in the plane R<sup>2</sup> and let ψ<sub>i</sub> be the dilation of ratio 1/2 around a<sub>i</sub>. The unique non-empty fixed point of the corresponding mapping ψ is a Sierpinski gasket and the dimension s is the unique solution of |