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From: olcott <polcott333@gmail.com>
Newsgroups: comp.theory,comp.lang.c,comp.lang.c++
Subject: Re: Every sufficiently competent C programmer knows --- Paraphrase of
 Sipser's agreement
Followup-To: comp.theory
Date: Sat, 15 Mar 2025 20:28:27 -0500
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On 3/15/2025 5:35 PM, dbush wrote:
> On 3/15/2025 5:27 PM, olcott wrote:
>>
>> <MIT Professor Sipser agreed to ONLY these verbatim words 10/13/2022>
>>      If simulating halt decider H correctly simulates its input D
>>      until H correctly determines that its simulated D would never
>>      stop running unless aborted then
>>
>>      H can abort its simulation of D and correctly report that D
>>      specifies a non-halting sequence of configurations.
>> </MIT Professor Sipser agreed to ONLY these verbatim words 10/13/2022>
>>
> 
> But he didn't agree to what you think he did:
> 
> 

THIS IS EXACTLY AND PRECISELY WHAT I THINK HE DID AGREE TO
(It took me years to form this precise paraphrase)

<Accurate Paraphrase>
If emulating termination analyzer H emulates its input
finite string D of x86 machine language instructions
according to the semantics of the x86 programming language
until H correctly determines that this emulated D cannot
possibly reach its own "ret" instruction in any finite
number of correctly emulated steps then

H can abort its emulation of input D and correctly report
that D specifies a non-halting sequence of configurations.
</Accurate Paraphrase>


-- 
Copyright 2025 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer