From: Spiros Bousbouras <spibou@gmail.com>
Subject: Re: Contracts in generic formal subprogram
Date: Wed, 12 Apr 2023 02:18:45 -0000 (UTC) [thread overview]
Message-ID: <wTNwzuVC4pvpqJ=Iw@bongo-ra.co> (raw)
In-Reply-To: <u13iae$2kj2n$1@dont-email.me>
On Tue, 11 Apr 2023 14:03:27 +0200
"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote:
> The formal meaning of weaker/stronger relation on predicates P and Q:
>
> weaker P => Q
> stronger Q => P
>
> The formal rationale is that if you have a proof
>
> P1 => P2 => P3
>
> Then weakening P1 to P1' => P1 and strengthening P3 => P3' keeps it:
>
> P1' => P2 => P3'
You have it backwards ; if P1' implies P1 then P1' is stronger
than P1 .
next prev parent reply other threads:[~2023-04-12 2:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-08 7:00 Contracts in generic formal subprogram mockturtle
2023-04-08 8:02 ` Dmitry A. Kazakov
2023-04-11 5:56 ` G.B.
2023-04-11 12:03 ` Dmitry A. Kazakov
2023-04-12 2:18 ` Spiros Bousbouras [this message]
2023-04-12 3:37 ` Spiros Bousbouras
2023-04-12 6:49 ` Niklas Holsti
2023-04-12 7:30 ` G.B.
2023-04-12 12:29 ` Ben Bacarisse
2023-04-13 6:27 ` Dmitry A. Kazakov
2023-04-08 9:09 ` Randy Brukardt
2023-04-08 16:48 ` Simon Wright
2023-04-08 17:27 ` mockturtle
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