Hello. I am jan Li (sorry for miswriting), and maybe I am one of those nasa people. I asked myself:
"Does any a priori number exist?"
I think it would be nice to have names for these two numbers, and I am explaining why.
Seven: the maximum number a human can "visualize" is seven (further numbers are seen divided, e.g. 8 = 4+4). So it is much concrete of a number.
150, that is, Dunbar's number: the to the number of people with whom one can maintain stable social relationships (further info.s: http://en.wikipedia.org/wiki/Dunbar%27s_number). This is another concrete number.
How to name them? I really don't know that. Hope Sonja will read this. Bye
A priori numbers
Re: A priori numbers
Well, these look like a posteriori numbers, ones found to be significant by experience. They are also somewhat questionable, 7 is a good approximation for that purpose, but the actual range is about 5 to 9 (the 9ers are, admittedly, rather rare and strange). 5 is pretty near universal even for people who don't have a word for 5 (tally marks, say). The social relationships one sounds like it is based on a mathematical model, whose congruence with reality is always very suspect.
But, in any case, they are numbers too big to be useful in tp.
But, in any case, they are numbers too big to be useful in tp.