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In the attached equation, how is the enlarged grouping symbol done? (XVIII, S. 127) Is the grouping symbol used only for the principal fraction line? Since there are cancellations, this is to be a spatial arrangement (XI, S. 60). Also, what is the significance of the box in the equation?
This is not an enlarged grouping sign. It is merely parentheses around the fraction. If you are doing the fraction spatially, as you should, the parentheses would go on the main line of the equation (the horizontal fraction line). As far as the box goes, without seeing the surrounding context, I am not able to make a judgement about it. Maybe you could attach a picture that shows more information.
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