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Index Catalog

The Index Catalogue (IC) appeared as two appendices to Dreyer[?]'s NGC catalog of deep sky objects. It summarized the discoveries of galaxies, clusters and nebulae between 1888 and 1905.

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Quadratic formula

... \right) x + \frac{c}{a}=0 </math> which is equivalent to <math>x^2+\frac{b}{a}x=-\frac{c}{a}.</math> The equation is now in a form in which ...