Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. In matrix algebra, the process of converting a square matrix into a diagonal matrix, usually to find the eigenvalues of the matrix.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. changing a square matrix to diagonal form (with all nonzero elements on the principal diagonal)
Etymologies
diagonal + isation (Wiktionary)
Examples

Second, the method that is used, called diagonalisation was already present in the work of du BoisReymond for building real functions growing faster than any function in a given sequence of functions.

A recent paper, Periods and elementary real numbers claims to exhibit one by means of a kind of diagonalisation argument.

The theoretical groundings of the recursive mathematics of GĂ¶del can be found in famous diagonalisation method of Cantor

Applying the usual diagonalisation argument (as in the proof of the
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