What does 'it' refer to here?
Hello there, I was asked a question about what the word "it" refers to in the following text.
Agnesi was the first woman to write a mathematics textbook and to be appointed to a university chair in math .... Agnesi's textbook was praised in 1749 by the French Academy: "It took much skill and good judgment to reduce to almost uniform methods discoveries scattered among the works of many mathematicians very different from each other."
"It took much skill ....." Does this "It" refer to "to reduce .... each other."?
What word would you say the phrase "very different from each other" modifies, discoveries or mathemiticians? At first reading it sounds like it modifies mathematicians, but judging from the content, I'd say discoveries.
Any opinions here would be much appreciated! Many thanks. MC