„Blockmatrix“ – Versionsunterschied
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</math>
where ''A''<sub>''k''</sub> is an square matrix; in other words, it is the [[Matrix addition#Direct sum|direct sum]] of ''A''<sub>1</sub>, …, ''A''<sub>''n''</sub>. Any diagonal square matrix can be trivially considered as a block diagonal matrix, taking ''n''=1.
==Application==
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