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$24.88
$24.88
A soft and lightweight tee featuring the formal symbolism for the law of excluded middle in propositional logic. The formula reads as "P or not-P". It is a foundational axiom in classical logic th...
$31.50
$31.50
The philosopher Ludwig Wittgenstein (1889-1951) was known for a stark division in his work, between an early and a late period that are sometimes treated as the works of two separate philosophers. ...
$24.88
$24.88
A soft and lightweight tee 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 foundational axiom in classi...
$12.24
$12.24
An embroidered patch with a durable twill weave featuring the formal symbolism for the law of excluded middle in propositional logic. The formula reads as "P or not-P". It is a foundational axiom ...
$12.24
$12.24
An embroidered patch with a durable twill weave featuring the formal symbolism for the law of excluded middle in propositional logic. The formula reads as "P or not-P". It is a foundational axiom ...
$12.24
$12.24
An embroidered patch with a durable twill weave featuring the formal symbolism for the law of excluded middle in propositional logic. The formula reads as "P or not-P". It is a foundational axiom ...
$12.24
$12.24
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...
$12.24
$12.24
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...
$12.24
$12.24
An embroidered patch 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 foundat...