FOM: difference, structure, congruence

Vaughan Pratt pratt at cs.Stanford.EDU
Tue Mar 17 21:16:18 EST 1998

Re Bill Tait's laconic comment on Leo Harrington's fascinating post, my
first reaction was "Et tu, brute?"  But then I decided it was about right.

Actually I was following Leo right up to the end (but then I followed
Sokal right up to the end too).  But then Leo closes with

>to get a foundation for the existence of things one might be
>led to emphasize differences over congruences since differences are
>what one ultimately points to when invoking existence.

Mind rephrasing that, Leo?  Best I could come up with was "doubletons
exist but singletons don't," which is how I understood the ancients to
regard numbers---what's the point of counting a singleton?

Reason I ask is that the context seems to make me the singleton and Steve
the doubleton.  It would disturb me to cogitare Steve est et non sum.

Vaughan Pratt

More information about the FOM mailing list