# [plt-scheme] first order predicate calculus

Dan,
Your question isn't quite clear.
If all you want to do is *represent* the statement, you can do that in
minutes. Just define a datatype for the grammar of first-order logic,
and then translate your sentence into instances of that datatype.
I suspect what you want is more than that. So here is a non-Scheme
recommendation.
Check out the Alloy Analyzer (alloy.mit.edu). You will get an elegant
ASCII notation for first-order logic, as well as a tool to determine
(up to certain bounds) whether there are errors in your assertions.
It takes a little while to get used to Alloy, but once you do it is
quite valuable and repays the investment. Think of it as a
lightweight way to explore designs over discrete, uninterpreted
domains, akin to calculators over numeric domains that you are used to
as an engineer.
(Kathi and I have a prototype of a tool that will connect Scheme to
the back-end of Alloy. If you are willing to suffer some pain, ask us
at the end of December and we'll send you the latest version.)
Shriram