1

Which one of following expression is more clear, grammatical and idiomatic?

He has difficulties on complex mathematical computation.

He has difficulties in complex mathematical computation.

He has difficulties with complex mathematical computation.

I prefer last one, but I am not sure and need double confirmation.

2

In other languages it might be suitable to use on or in. In English, the correct way is:

He has difficulties with complex mathematical computation.

Depending on the exact desired meaning, you may use:

He has difficulties doing complex mathematical computation.


Additionally, you should use the plural: computations:

He has difficulties doing complex mathematical computations.

  • Thanks for your answer. I'll go with He has difficulties with complex mathematical computation. Should this one use computations? – JJJohn Jun 11 at 10:18
  • Plural in all of them. – virolino Jun 11 at 10:24
  • Plural is not needed if you consider the uncountable meaning, which I thinks makes more sense here (i.e. - the general act of computing things, rather than a set of particular computations) – Tim Foster Jun 11 at 11:05
  • Unless needed, communication needs (according to my exeprience) to be as specific as possible. This is why I preferred to take into account the countable form, rather the uncountable. – virolino Jun 11 at 11:14

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