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## Homework Statement

This is the equation for stresses and strains in a multilayered lamina. The actual purpose is irrelevant as I just am unsure what exactly the equation is saying (is it A * B * B^-1 * D^-1)

I am unfamiliar with this matrix syntax.

## Homework Equations

Below is a link to an image of the actual equation that needs to be solved. Note that A, B, D are all 3 x 3 matrices, while epsilon, K, N and M are all 3x1 matrices.

http://ars.els-cdn.com/content/image/1-s2.0-S1359836802000021-si28.gif

## The Attempt at a Solution

I honestly am completely unsure how to invert Matrix AB / BD as it is a matrix of 4 matrices, what function do we do to the matrix initially to get it to the form that will allow us to invert it, so that we can solve for epsilon and K (assuming we have N, M, A, B, D).

edit :::: Also, from my instructor, the matrix AB BD has dotted lines seperating each letter.

I also don't expect to do any hand manipulation as we are allowed to use TI89 on the test (so any kind of matrix manipulation that one can do with a calculator with a matrix function is fine)

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