# In differentiation as in dy/dx what do you call y and x? [closed]

Like numerator / denominator, but for differentiation.

• If it helps, they're generally called "infinitesimals" I don't seem to be able to find specific terms for the numerator and denominator... as it's still a division problem, so I'd argue the terms are still apt. May 24, 2015 at 20:33
• The `dependent` and `independent` variables respectively. Technically speaking `dy/dx` isn't a fraction; it's a limit. May 24, 2015 at 20:46
• I think this is on topic here, but would be likely to get better answers, and to get answers more quickly, on the math Stack Exchange site. I think terminology questions are on topic there as well. May 24, 2015 at 20:47
• Here's a related question (it's half of yours) on Math that includes the suggestion differentiand (a neologism) for "that which is to be differentiated", by analogy with other Latin forms like addend = "that which is to be added" and multiplicand = "that which is to be multiplied". math.stackexchange.com/questions/656466/… May 24, 2015 at 20:54
• I'm voting to close this question as off-topic because it is predicated on the misconception that dy/dx is decomposable. May 24, 2015 at 21:36

`dy/dx` is a limit in which `y` represents the dependent variable and `x` the independent variable. Since it is a limit, technically it is not a fraction.