Long ago I saw a quote in a textbook on the Lebesgue integral. Here is the quote the author used:
There are nine and sixty ways of constructing tribal lays,
And--every--single--one--of--them--is--right.
Rudyard Kipling, In the Neolithic Age (1892).
Kipling is alluding to literary controversies and the textbook author meant to apply this to the well-known situation that the Lebesgue integral can be and has been developed in more than a dozen ways.
My question is just which textbook and which author was this? I want to refer to it and cannot without knowing this. Surely it was a British author from an earlier generation that would have been more literate than I.
