# Diagonalization

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In mathematics, **diagonalization** may refer to:

- Matrix diagonalization, a construction of a diagonal matrix (with nonzero entries only on the main diagonal) that is similar to a given matrix
- 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
- Table diagonalization, a form of data reduction used to make interpretation of tables and charts easier.

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