matrix and diagonal rule

[Bama Braille]

What is the best way to transcribe the matrices in Third-Order Determinant box and Example #b.
I've considered tooling a circle around the affected parts or using parentheses inside the matrix to set the lined out numbers and letters apart. Neither way seems very good to me, I'm sure you have a better suggestion, thanks!

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[dworthing]

I meant to say cancellation, not parens. so to restate my question, is it ok to use cancellation within a matrix or should I tool, thank you!

[betty.marshall]

I'm getting some advice on this from some other committee members.
Betty

[Bama Braille]

Hi. One committee member suggested using a bold typeform indicator for the numbers with the diagonal lines. This would require a tn explaining the way the diagonal lines are represented. Speaking for myself, I would tool a diagonal line that did not obscure the numbers because even with a tn, I think it would be difficult to recognize that the numbers should be read on the diagonal instead of just as a series of bold numbers in the matrix. Either way would require a tn.

[Bama Braille]

I'll tool with a tn, Thanks, Dorothy.

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