I think we’ve had essentially this same discussion before.
The root of the dilemma, I think, is that the square root glyph can be interpreted several ways.
can be considered simple equivalent to
,
, or various infinite series expressions, in which case its sign is positive.
Or,
can be considered the description of a set,
, which is equivalent to
.
As long as writer and reader are aware of which connotation is appropriate for the use to which the glyph is being put, there should be no problem.
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