A declarative logic programming system with first-class relations
embedded in a pure functional subset of Scheme. The system has true
unions, fair scheduling, lexically-scoped logical variables,
set-theoretical semantics, high performance without cuts
A Scheme (guile) interface to a local version of the Encyclopedia of integer Sequences with many features for complex queries. URL of the encyclopedia (where the database can be downloaded from) is: www.research.att.com/~njas/sequences/