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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

... usual form of the quadratic formula is not ideal. See Loss of significance for details. Derivation The quadratic formula is derived by the method of completing the ...