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==Logical vectors==
{{Group-like structures}}
If ''m'' or ''n'' equals one, then the ''m'' × ''n'' logical matrix (''m''<sub>''ij''</sub>) is a '''logical vector''' or [[bit string]]. If ''m'' = 1, the vector is a row vector, and if ''n'' = 1, it is a column vector. In either case the index equaling 1 is dropped from denotation of the vector.
Suppose <math>(P_i),\, i=1,2,\ldots,m</math> and <math>(Q_j),\, j=1,2,\ldots,n</math> are two logical vectors. The [[outer product]] of ''P'' and ''Q'' results in an ''m'' × ''n'' [[rectangular relation]]
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