[m-dev.] Inductive goals

Mark Brown mark at mercurylang.org
Thu Jan 23 21:33:00 AEDT 2014

On Thu, Jan 23, 2014 at 3:21 PM, Michael Richter <ttmrichter at gmail.com> wrote:
> On 23 January 2014 10:20, Peter Schachte <pschachte at gmail.com> wrote:
>>     $X from $Start to $End by $Func
>> which is equivalent to {$X,Func($X)} folds {$Start,$End}
> It's also equivalent to FOR X = 1 TO 100 STEP 3, just a bit more general.  I
> thought I'd left that behind me in the '70s.  It appears Dijkstra may have
> been right.

Are you referring to this:

    "No loop should be written down without providing a proof for termination
    nor without stating the relation whose invariance will not be destroyed by
    the execution of the repeatable statement." [0]



[0] http://www.cs.utexas.edu/~EWD/transcriptions/EWD03xx/EWD340.html

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