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I have written the sentence

One difficulty when performing a numerical integral arises when one does not know the exact function being used (for example, in signal processing), but is instead cumulatively calculating data points that are then fed into an integral function.

"Is" sounds incorrect here; what should the verb be? I tried "are", but that doesn't sound right either. Would it be better to split up the sentence?

In short, how can I formulate this so that it is grammatically correct?

  • @PeterShor, yup, I mistyped, it should be "function" – heather Jun 26 '18 at 22:08
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    "one does not know", "one is" (i.e., one is the subject of is, it seems to me – Xanne Jun 26 '18 at 22:56
  • @Xanne it does sound a little over-done, but that works. It certainly sounds better than before. Thanks =) – heather Jun 26 '18 at 23:00
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    I wasn't suggesting it needed to be changed; I was just explaining how I'd parse it. I thought you were quoting something. – Xanne Jun 26 '18 at 23:05
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    "when one does not know… but instead cumulatively calculates…" – Kevin Jun 26 '18 at 23:48
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Neither is nor are will make this sound right; the correct approach is to make the verb tenses in the phrases match:

when one does not know… but instead cumulatively calculates…

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