Diagonalization
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In mathematics, diagonalization may refer to:
- Diagonal matrix, which is in a form with nonzero entries only on the main diagonal
- Diagonalizable matrix, which can be put into a form with nonzero entries only on the main diagonal
- Diagonal lemma, used to create self-referential sentences in formal logic
- Diagonal argument (disambiguation), various
- Cantor's diagonal argument, used to prove that the set of real numbers is not countable
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