As has been pointed out ... vs As it has been pointed out ...
This has been taken from a book of mathematics. The question is if it is necessary to use the subject "it". The full sentence in the original book is:

"As has been pointed out already, in the solution of an eigenvector we need to use iteration. "

Thanks in advance.

Question

As has been pointed out ... vs As it has been pointed out ...
This has been taken from a book of mathematics. The question is if it is necessary to use the subject "it". The full sentence in the original book is:

"As has been pointed out already, in the solution of an eigenvector we need to use iteration. "

Thanks in advance.

Answer

Using "it" is, occasionally, optional.

It is, occasionally, optional using "it".

Answer

It might not be wrong to add an “it” but it would be clearly inferior to the wording given. The need to use iteration does not result from something being pointed out.
Consider “As above, in the solution of ...” “As previously discussed, in the solution of ..”

Answers · 2

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