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• 14:51, 19 October 2022 Gianfranco talk contribs created page Store:FLen04 (Created page with "===<!--70-->Set operators=== <!--71-->Given the whole universe <math>U</math> <!--72-->we indicate with <math>x</math> <!--73-->its generic element so that <math>x \in U</math>; <!--74-->then, we consider two subsets <math>A</math> and <math>B</math> <!--75-->internal to <math>U</math> <!--76-->so that <math>A \subset U</math> <!--77-->and <math>B \subset U</math> {| |left|80px |'''<!--78-->Union:''' <!--79-->represented by the symbol <math>\cup</m...")