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In order to designate the row and column numbers of the matrix, the sets ''X'' and ''Y'' are indexed with positive [[integer]]s: ''i'' ranges from 1 to the [[cardinality]] (size) of ''X'', and ''j'' ranges from 1 to the cardinality of ''Y''. See the article on [[indexed set]]s for more detail.
The [[transpose]] <math>R^T</math> of the logical matrix <math>R</math> of a binary
===Example===
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