From: Galchin Vasili <vngalchin@yahoo.com>
To: categories@mta.ca
Subject: Wesley Phoa's Intro on Fibrations, Toposes, Effective Toposes
Date: Thu, 5 Jun 2003 10:39:38 -0700 (PDT) [thread overview]
Message-ID: <20030605173938.64548.qmail@web12204.mail.yahoo.com> (raw)
Hello,
Questions concerning:
http://www.lfcs.informatics.ed.ac.uk/reports/92/ECS-LFCS-92-208/
I am familiar with natural deduction and
sequents. In the chapter on Toposes (Chapter 3), I
have some questions about the very beginning where
propositional calculus (intuitionistic) is discussed
1) Did he leave out the Elimination rule for V? I do
see in the second line on far right a rule for V, but
it doesn't look like EV???
2) I don't understand the Structual rules. Can anybody
give me a short explanation?
Regards, Bill Halchin
reply other threads:[~2003-06-05 17:39 UTC|newest]
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