Excellent talk by Guy Steele explaining the history of maths/comp notations that can probably lead you to the right path through original sources: https://m.youtube.com/watch?v=dCuZkaaou0Q

Then have a look at this extremely underrated talk by Alexander Stepanov for basically falling in love with maths (he gives a long view of maths in general adorned with beautiful commentary): https://m.youtube.com/watch?v=fanm5y00joc