Can We Subtract Matrices with Different Dimensions?

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Quarlep
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We have a matrix A4x5 and B2x3 can we remove(-) them A-B

Thanks
 
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That depends upon what you mean by "remove". Normally "-" means "subtract". That is defined only for matrices with the same number of rows and columns.

If you mean [itex]a_{ij}- b_{ij}[/itex], taking [itex]b_{ij}= 0[/itex] if i> 2 and j> 3, you can define that (you can define anything) but it will not obey any of the usual algebraic rules- so probably won't be of much use.