SPASS is an
automated theorem prover for
first-order logic with equality
In mathematics and other formal sciences, first-order or first order most often means either:
* "linear" (a polynomial of degree at most one), as in first-order approximation and other calculus uses, where it is contrasted with "polynomials of hi ...
developed at the
Max Planck Institute for Computer Science
Max or MAX may refer to:
Animals
* Max (dog) (1983–2013), at one time purported to be the world's oldest living dog
* Max (English Springer Spaniel), the first pet dog to win the PDSA Order of Merit (animal equivalent of OBE)
* Max (gorilla) ...
and using the
superposition calculus The superposition calculus is a calculus for reasoning in equational first-order logic. It was developed in the early 1990s and combines concepts from first-order resolution with ordering-based equality handling as developed in the context of (un ...
. The name originally stood for ''Synergetic Prover Augmenting Superposition with Sorts''. The theorem proving system is released under the
FreeBSD license
BSD licenses are a family of permissive free software licenses, imposing minimal restrictions on the use and distribution of covered software. This is in contrast to copyleft licenses, which have share-alike requirements. The original BSD lice ...
.
An extension of SPASS called SPASS-XDB added support for on-the-fly retrieval of positive unit axioms from external sources. SPASS-XDB can thus incorporate facts coming from
relational databases,
web services, or
linked data
In computing, linked data (often capitalized as Linked Data) is structured data which is interlinked with other data so it becomes more useful through semantic queries. It builds upon standard Web technologies such as HTTP, RDF and URIs, but ...
servers. Support for arithmetic using
Mathematica was also added.
References
Sources
*.
External links
*{{Official website, www.spass-prover.org
Free theorem provers
Unix programming tools
Max Planck Institute for Informatics