Brief Addendum on the Overview Effect in Formal Thought
Some time ago on my other blog in The Overview Effect in Formal Thought I discussed the intuitive significance of seeing things whole, which in the context of formal thought means the use of a concise notation that allows one to see in one glance the idea expressed by the symbolism.
On this I cited a quote from Russell and Whitehead’s Principia Mathematica:
“The terseness of the symbolism enables a whole proposition to be represented to the eyesight as one whole, or at most in two or three parts divided where the natural breaks, represented in the symbolism, occur. This is a humble property, but is in fact very important in connection with the advantages enumerated under the heading.” (Bertrand Russell and Alfred North Whitehead, Principia Mathematica, Volume I, second edition, Cambridge: Cambridge University Press, 1963, p. 2)
A discussion today on the FOM (foundations of mathematics) listserv made me aware that there is a temporal as well as a spatial component to the overview effect in formal thought. A notation must not only represent a proposition, “to the eyesight as one whole,” as Russell says, but it must also allow the mathematician to develop his ideas rapidly and efficiently without being so unwieldy that it slows down the process of thought, hampering the formal expression of an idea rather than facilitating the same.
One might reformulate the quote above in terms of temporality such that, the terseness of the symbolism enables the development of an exposition and the proof of a theorem so that it is represented to intuition as one whole in time. This is a very different approach to the intuition of time in formal thought than that which Brouwer employed as the basis of intuitionism.
I am reminded of a passage from Bertrand Russell’s Autobiography in which he described Alfred North Whitehead, his co-author on Principia Mathematica:
“His capacity for concentration on work was quite extraordinary. One hot summer's day, when I was staying with him at Grantchester, our friend Crompton Davies arrived and I took him into the garden to say how-do-you-do to his host. Whitehead was sitting writing mathematics. Davies and I stood in front of him at a distance of no more than a yard and watched him covering page after page with symbols. He never saw us, and after a time we went away with a feeling of awe.”
Whitehead, apparently, had a symbolic notation sufficient to his purposes and allowing him to cover page after page in symbols, recording his thought as he went. Many are the philosophers of mathematics who have pointed out that the level of formal rigor in Russell and Whitehead’s Principia Mathematica fell short of the standard that Frege had already employed some years previously in his Grundgesetze der Arithmetik. While this cannot be denied, there may be a point to a less-than-perfect rigor which nevertheless allows for rapidity and fluency of expression.
It seems that logic and mathematics require just enough formalization in order to be fruitful, but not too much. I once wrote, sufficient unto the day is the rigor threreof. Perhaps I should have written, sufficient unto the moment is the rigor thereof. Think of this as one aspect of the ethos of formal thought.