[Haskell-cafe] Re: ANNOUNCE zeno 0.1.0
lrpalmer at gmail.com
Sat Nov 13 16:11:43 EST 2010
Is the source code public, so I can run it on my own machine?
>> Hi all,
>> My masters project Zeno was recently mentioned on this mailing list so
>> I thought I'd announce that I've just finished a major update to it,
>> bringing it slightly closer to being something useful. Zeno is a fully
>> automated inductive theorem proving tool for Haskell programs. You can
>> express a property such as "takeWhile p xs ++ dropWhile p xs === xs"
>> and it will prove it to be true for all values of p :: a -> Bool and
>> xs :: [a], over all types a, using only the function definitions.
>> Now that it's updated it can use polymorphic types/functions, and you
>> express properties in Haskell itself (thanks to SPJ for the
>> suggestion). It still can't use all of Haskell's syntax: you can't
>> have internal functions (let/where can only assign values), and you
>> can't use type-classed polymorphic variables in function definitions -
>> you'll have to create a monomorphic instance of the function -but I
>> hope to have these added reasonably soon. It's also still missing
>> primitive-types/IO/imports so it still can't be used with any
>> real-world Haskell code, it's more a bit of theorem proving "fun".
>> You can try it out at http://www.doc.ic.ac.uk/~ws506/tryzeno, the code
>> file given there has some provable properties about a few prelude
>> functions among other things.
>> Another feature is that it lists all the sub-properties it has proven
>> within each proof. When it verifies insertion-sort "sorted (insertsort
>> xs) === True" it also proves the antisymmetry of "<=" and that the
>> "insert" function preserves the "sorted" property.
>> Any suggestions or feedback would be greatly appreciated.
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