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$12.24
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An embroidered patch made with a durable twill weave featuring the formal symbolism for the law of non-contradiction in propositional logic. The formula reads as "not both P and not-P". It is a fo...
$14.44
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$14.44
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Our "love everyone" series features the logical formula ∀x❤x. A play on symbolic logic, we added a heart symbol as a new predicate to the usual symbolism in formal first-order languages to spell ou...