```
Hi, everyone!

I'm trying to analyse the block structure of a matrix in Mathematica to
figure out the best way to solve a system with this matrix.

For example I write

A := {{GL,0,0,0,IL[1]},
{GT,0,0,0,0},
{0,GL,0,0, IL[2]},
{0,GT,0,0,0},
{0,0,GL,0,IL[3]},
{0,0, GT,0,0},
{0,0,0,GL,IL[4]},
{0,0,0,GT,0}}
X := {XP1,XP2,XP3,XP4,XL}
B := {0,PT[1],0,PT[2],0,PT[3],0,PT[4]}

where GL, GT, IL, etc., are not elements but (sub-)matrices themself. I
want to perform algebraic transformations on A, but I want element
multiplication to be non-commutative and inversion to use Inverse
rather than 1/element.

Can I somehow trick Mathematica to assume that elements are matrices?

Any help is appreciated!

Paul

--
("`-''-/").___..--''"`-._   UNIX *is* user-friendly, he is just very
`6_ 6  )   `-.  (     ).`-.__.`) picky about who his friends are...
(_Y_.)'  ._   )  `._ `. ``-..-'      Paul Bunyk, Research Scientist
_..`--'_..-_/  /--'_.' ,'art by           (and part-time UN*X sysadm)
(il),-''  (li),'  ((!.-' F. Lee http://pbunyk.physics.sunysb.edu/~paul

```

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