I will admit that this questions isn't exactly mathematics, but it involves mathematical logic so I thought I would try here. If I am in the wrong place just let me know.
I am reading 'Landmark Writings in Western Mathematics 1640 - 1940' by I. Grattan-Guinness. While reading the chapter on Russell and Whitehead's 'Principia Mathematica' (PM) I came across a portion that doesn't make sense to me. When discussing the clarity issues of PM it says: "The difficulty concerns incoherence of expression; it largely sprang from the inherited Peanist belief that logic was an absolutely general discipline, so that (as we now say) there is no room to talk about it."
It is the last part of the sentence that I don't understand. What is a "general discipline"? I tried looking this up and found nothing, so I am assuming it is not a term of mathematical philosophy. There is also, obviously some sort of insiders comment there when they say 'there is no room to talk', can you explain that as well? A part of me reads this and thinks they might just be implying that there are almost no descriptions for any of the approx. 500 definitions in the book, but that seems too simple a meaning. If you have any ideas about this I would love the help. Thanks!