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1. I have drawn the matrices in my notes with square brackets, curved brackets or straight lines and curved ends. I always just copied what the slide show or board notes had up at the time.

Is it preferable to draw matrices with one type of bracket around them compared to another?

2. When calculating the determinant of the matrix I have used delta, Δ, to represent the det. of the matrix but I can't find reference to the use of delta anywhere else?

3. When writing the inverse of a matrix I haven't divided the entities of the matrix by the determinant. I have just writing it as 1 / det. and put this in front of the matrix?

Is this correct or should I get rid of the 1/det. by multiplying it into the matrix?

Thanks

AL