stepchowfun / theorem-prover Goto Github PK
View Code? Open in Web Editor NEWAn automated theorem prover for first-order logic.
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mkerem glavin001 linearregression synpon goo-yao russkifightman solertis teknomo solversa ehsan-keshavarzian jih332 binary10 xuntiange ratnania liwii countinglogic sagnibak eularczer joshuachou2018 2catycm sgoguen stjordanis bluelight1324 taziksh dataronio si7339 sushmaakoju knyjs0710 alamhasabie sirneij satishsrinivasantheorem-prover's Issues
Problem finding proof
The input
(forsome x. forsome y. P(x, y)) implies (forsome y. forsome x. P (x, y))
seems to send the prover into a loop.
Invalid proof found
The program finds a proof for
(forall x. forsome y. P(x,y)) implies (forsome y. forall x. P(x,y))
Gödel's first incompleteness theorem
There's an information in readme there are some unprovable formulae that will cause this program to loop forever and it is said that's the consequence of Gödel's first incompleteness theorem. I belive that it is rather connected to Church incompletness theorem from 1936 (http://en.wikipedia.org/wiki/Entscheidungsproblem).
Question about uniqueness quantification
Thank you for this useful program.
Is there a way to represent formulas with uniqueness quantifier such as ∃!xP(x) ≡ ∃x(P(x)∧∀y(P(y)→y=x))?
Syntax error with Python 3.4
When starting main.py with Python 3.4 on Windows 8 I get a syntax error:
File "C:...\main.py", line 355
print "First-Order Logic Theorem Prover"
^
SyntaxError: invalid syntax
Problem when running one of the examples
When i try to run the "forall x. P(x) implies (Q(x) implies P(x))" example i get multiple errors , do you know why that could be ?
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