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Thanks for your answer. I would like to try break the lines manually.

i have 4x4 matrix which is very wide. This matrix is wider than the text's margin. i want to make the next column (coloumn 3 and 4) lies below the preceding coloum (coloumn 1 and 2). Please tell me how to do that! I just simply using vmatrix environment. Sorry for my english and thank you.