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added 20 characters in body

edited May 12, 2017 at 17:32

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$$\operatorname{average}(x_1,\dots,x_n) = \dfrac{x_1 + \cdots + x_n}{n}.$$

$$\operatorname{cross-ratio}(z_1,z_2;z_3,z_4) = \dfrac{(z_1-z_3)(z_2-z_4)}{(z_2-z_3)(z_1-z_4)}.$$

answered Dec 14, 2010 at 21:59

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