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I need your help in using the right verb construction in math text.

c+d= v

What verb should I use to describe this expression?

c+d define/express/point/recognize/indicate as v

edit 1: Guys, I know, c plus d is equal to v.

Sometimes we define some part of the equation as a new variable to make our calculation easily.

For example:

x=a+b+c+d (1)

c+d=v (2)

Using (2) the (1) can be rewritten as x=a+b+v (3)

I am looking at a verb to describe (2). I am not sure that "lets "c+d" define as "v" " can be correct

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    "C plus D equals E". Or "the sum of C and D is E". – Hot Licks Jul 31 at 12:13
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    At what level, Anna? When teaching basic maths, 'The sum of c and d is v' is about all that one would expect to hear. In university-level treatments, 'the product / resultant of the binary operation c plus d is v' or 'c plus d maps to v' are more likely. But don't use the generalised sense of 'product' with kids, who are taught that it's only for the resultant when the operator is 'multiplied by'. – Edwin Ashworth Jul 31 at 12:15
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    When there is an = sign in there, I would not say "maps to". What verb? "C plus D equals V". or even "C plus D is V". – GEdgar Jul 31 at 12:30
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    It depends on what your symbols represent and what you are trying to express. A definition usually puts the symbol being defined on the left of the equality operator. One possibility is that c, d and v satisfy the relation c + d = v – Global Charm Jul 31 at 14:04
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    As you are seeing from the comments, it very much depends on the context. Please explain who your audience is, and please show us the actual text you are trying to write, i.e. the actual mathematical objects involved. If possible, show us at least the whole surrounding paragraph, rather than just the relevant sentence. A lot of us here have quite a bit of background in mathematics; someone will be able to handle it even if it is very technical. – linguisticturn Jul 31 at 15:09

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