Here A is a number.

A, and hence A^3, is positive

A, and hence A^3, are positive.

which is right? I prefer the first.

  • A^ you mean pow(A, 3)? – Zhang Apr 23 at 7:40
  • Yes. It is mathematical. – wdlang Apr 23 at 8:01

You have the conjunction "and" connecting two items of equal weight. Therefore, you should use the plural.

A, and hence A^3, are positive.

  • So, without the 'and', I should say, A, hence A^3, is positive? – wdlang Apr 23 at 6:15
  • 1
    I am not sure that your new sentence is correct in English. However, even without "and", you still have two things as the subject to one verb, so the plural is still recommended. – virolino Apr 23 at 6:17

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