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Engraver

An engraver is a person who engraves designs on metal etc. The engraver can execute an original engraving as an independent work of art invented by him/herself, or, as a reproductive engraver, divulgate an idea expressed in a painting, drawing, statue etc. invented by an artist other than the engraver.

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Quadratic formula

... The formula and its proof remain correct if the coefficients a, b and c are complex numbers, or more generally members of any field whose characteristic is not 2. (In a ...