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*From*: Michel Charpentier <michel.ch...@xxxxxxx>*Date*: Wed, 11 Feb 2015 11:33:55 -0800 (PST)*References*: <74871342-8fab-40ff-a050-8ba336333980@googlegroups.com> <CAAWQ4M5tBbNpxm5Sz-EtBL7pt4SdiHbLbw=FZnZLghT33=2WRQ@mail.gmail.com> <CAAWQ4M4jYyePzi-2cUv1QQ7dkHa-_rWA1VKER2pwGHR8JDeCmw@mail.gmail.com>

Another solution, which I find easier to read: http://cs.unh.edu/~charpov/stone.tla

It probably requires more work from TLC but less thinking on my part!

MC

On Wednesday, February 4, 2015 at 7:56:27 PM UTC-5, Leslie Lamport wrote:

On Wednesday, February 4, 2015 at 7:56:27 PM UTC-5, Leslie Lamport wrote:

I just posted in the CodePlex repository a TLA+/TLC solution to this problem for arbitrary weight of stone and number of pieces. The repository is atClick on Source Code > examples > Stones. However, I recommend trying to write such a solution yourself before looking at mine.On Wed, Feb 4, 2015 at 1:48 PM, TLA Plus <tlap...@xxxxxxxxx> wrote:Thanks for the puzzle. It took me just a little more time to write a spec that allows TLC to solve the problem than to solve it myself. (However, I had heard it before and so recreating the solution was easy.) TLC found the solution in a few seconds. I will leave this as a puzzle for readers to solve, and I hope others will do the same. I therefore rejected an email someone just sent that reveals the solution, although not the TLA+ spec that allows TLC to solve it. After TLC shows you the answer, the reasoning behind it becomes fairly obvious.On Wed, Feb 4, 2015 at 1:15 PM, step...@xxxxxxxxx <guy...@xxxxxxxxx> wrote:

A farmer has a 40 pound stone and a balance scale. How can he break the stone into 4 pieces so that, using those pieces and the balance scale, he can weigh out any integral number of pounds of corn from 1 pound through 40 pounds.

Who to use TLA+ to specify the problem and use TLC to find the solution?

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