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How can I type a block matrix for instances a square that divided on each side between lines in LaTeX? Namely between $...$?

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Could you add an example of what you are trying to achieve? An MWE of what you have tried so far would be useful as well. – Roelof Spijker Feb 17 '12 at 10:40

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Try the easybmat package.

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Let say we have three matrix A,B,C then in multiplication C=A*B we have M_ij:=(A_ij,B_ij,C_ij) – Mohammad Feb 17 '12 at 11:16
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Sorry, this comment doesn't make sense to me at all. – Ian Thompson Feb 17 '12 at 11:26
Let say we have three matrix A,B,C then in multiplication C=A*B we have M_ij:=(A_ij,B_ij,C_ij) such that each A_ij/B_ij/C_ijs are agian block matrices.. So I want to say sth like "(A_01,B_10,C_00)=(...,...,...)" that use the structure of subblocks like sqaure of a square that partitioned only in one quarter, so on... – Mohammad Feb 17 '12 at 13:03
@Mohammad: Still does not make sense to me. This is another case that shows that it is always best to provide a MWE that illustrates the problem. – Peter Grill Feb 17 '12 at 22:03
And such Minimal Example can be an image from Paintbrush or Word or whatever, showing how you want it all arranged. – tohecz Feb 17 '12 at 22:20

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