Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: dbush Newsgroups: comp.theory Subject: Re: Every sufficiently competent C programmer knows --- Semantic Property of Finite String Date: Wed, 12 Mar 2025 22:49:31 -0400 Organization: A noiseless patient Spider Lines: 28 Message-ID: References: <5429f6c8b8a8a79e06b4aeefe677cc54a2a636bf@i2pn2.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Thu, 13 Mar 2025 03:49:31 +0100 (CET) Injection-Info: dont-email.me; posting-host="bfda177ea2e5d824256b51a2c43e6950"; logging-data="3050027"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/SqZKd9wv2NcauAO85chQ9" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:/uzwVJuoKVtND2rUUOpmZULBDKc= Content-Language: en-US In-Reply-To: Bytes: 2184 On 3/12/2025 10:41 PM, olcott wrote: > On 3/12/2025 7:56 PM, dbush wrote: >> On 3/12/2025 8:41 PM, olcott wrote:>> >>> >>> NOT WHEN IT IS STIPULATED THAT THE BEHAVIOR BEING >>> MEASURED IS >> >> >> The direct execution of DDD > > is proven to be different than the behavior of DDD > emulated by HHH according to the semantics of the > x86 language. > Which is not what a solution to the halting problem is stipulated to compute: Given any algorithm (i.e. a fixed immutable sequence of instructions) X described as with input Y: A solution to the halting problem is an algorithm H that computes the following mapping: (,Y) maps to 1 if and only if X(Y) halts when executed directly (,Y) maps to 0 if and only if X(Y) does not halt when executed directly