


ileanTAP is a Prolog program that implements a sound and complete
theorem prover for firstorder intuitionistic logic. It is based on
freevariable semantic tableaux extended by an additional prefix
unification to ensure the particular restrictions in intuitionistic
logic. Due to the modular treatment of the different connectives
the implementation can easily be adapted to deal with other
nonclassical logics.
Features of ileanTAP

Theorem prover for intuitionistic firstorder logic.

Based on a freevariable semantic tableau calculus.

Sound and complete.

Decision procedure for the fragment where negation
occurs only positively and which contains only existential
quantified variables.

Source code available for popular
Prolog systems, including ECLiPSe Prolog, SWIProlog and
SICStus Prolog.

Simple firstorder form input format.
The short paper contains a description of the
source code and some performance results achieved with ileanTAP.

Jens Otten.
ileanTAP: An Intuitionistic Theorem Prover.
In D. Galmiche, editor, International Conference TABLEAUX'97,
LNAI 1227, pages 307312.
Springer Verlag, 1997.
·
ileantap_tab97.pdf
(171 kbytes)
·
ileantap_tab97.dvi
(31 kbytes)
The source code of ileanTAP is available for
ECLiPSe Prolog,
SWIProlog and
SICStus Prolog;
it should run on most other Prolog systems as well.
Please contact us if you encounter
any problems when downloading or running ileanTAP on your system.
The ileanTAP prover is invoked with
prove(F). where F
is a firstorder formula. For example
prove( all X: ex Y:(~q,p(Y) => p(X)) ).
will prove the validity of the given formula.
The logical connectives are expressed by "~" (negation),
"," (conjunction), ";" (disjunction), "=>"
(implication), "<=>" (equivalence); quantifiers are
expressed by "all X:" (universal) and "ex X:"
(existential). See the
documentation for more details about
the syntax of firstorder formulas.
Here is a selection of links related to ileanTAP.

leanTAP
 a compact Prolog theorem prover for firstorder logic based on
analytic tableaux by Bernhard Beckert and Joachim Posegga.

ModLeanTAP
 a compact Prolog theorem prover for modal logics based on
analytic tableaux by Bernhard Beckert and Rajeev Goré.

linTAP
 a compact Prolog theorem prover for the multiplicative and
exponential fragment of Girard's linear logic.

leanCoP
 a compact Prolog theorem prover for classicalfirst order
logic.

ncDP
 a compact Prolog nonclausal "DavisPutnam" prover.
Please feel free to contact us if you have any
questions about ileanTAP. If you have any suggestions for improvements
or if you have done something interesting with ileanTAP, please
let us know about it.
