Szukana fraza: [Abstract = "There are too few applications of complex numbers in the technique and science, therefore it is obvious that the use of complex analysis should have an increasing range. One of the first people to use complex numbers was Girolamo Cardano. Cardano, using complex numbers, was solving cubic equations, unsolvable to his times \- as the famous Franciscan and professor of mathematics Luca Pacioli put it in his paper \"Summa de arithmetica, geometria, proportioni et proportionalita\" \(1494\)."]

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