[Openmcl-devel] inverse function

Ron Garret ron at flownet.com
Sat Feb 13 19:18:25 UTC 2010


But inverting these functions *is* possible.  It's just very, very hard.

rg

On Feb 13, 2010, at 10:55 AM, Taoufik Dachraoui wrote:

> Hi Ron,
> 
> I am aware that not all functions have inverses, that is why I said "if possible"
> 
> Kind regards
> Taoufik
> 
> 
> On Sat, Feb 13, 2010 at 6:31 PM, Ron Garret <ron at flownet.com> wrote:
> 
> On Feb 13, 2010, at 4:20 AM, Taoufik Dachraoui wrote:
> 
>> 
>> Does someone know if there is any work done to generate an inverse of any given lisp function (if possible).
> 
> *Any* given function?  That would be quite the trick.  If you can figure out how to invert, say, AES-ENCRYPT do let us know. Or DELETE-FILE.  Inverting multiplication would be pretty cool too.  Here's a test case for you:
> 
> (funcall (invert #'*) 412023436986659543855531365332575948179811699844327982845455626433876445565248426198098870423161841879261420247188869492560931776375033421130982397485150944909106910269861031862704114880866970564902903653658867433731720813104105190864254793282601391257624033946373269391)
> 
> rg
> 
> 

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