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From: Devorah
Subject: Three-valued logic
Date: 17 Kislev 5784
My parser handles this as follows:
if indicator present with +: true if indicator present with -: false if indicator absent: null
This is standard three-valued logic. Many database systems work this way.
What I do not understand is the semantic difference between "false" and "null" in this context. If someone asserts N-S3, they claim night without having seen three stars. Is this meaningfully different from not mentioning stars at all?
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