Logic

T-shirts, hoodies and other accessories with jokes and imagery about logic, the philosophical study of valid reasoning.
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Law of Excluded Middle: Logic T-Shirt
Law of Excluded Middle: Logic T-Shirt
$24.88
$24.88
Law of Excluded Middle: Logic T-Shirt
Law of Excluded Middle: Logic T-Shirt
$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...
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Love Everyone: Logic Pride Heart Yoga Leggings
Love Everyone: Logic Pride Heart Yoga Leggings
$42.00
$42.00
Love Everyone: Logic Pride Heart Yoga Leggings
Love Everyone: Logic Pride Heart Yoga Leggings
$42.00
$42.00
This design uses the universal quantifier symbol (∀) and employs a pride heart design with the ubiquitous rainbow Pride Flag as a predicate symbol meaning "I love" or "is loved". We covered these s...
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Love Everyone: Kids Pride Heart Hoodie
Love Everyone: Kids Pride Heart Hoodie
$32.88
$32.88
Love Everyone: Kids Pride Heart Hoodie
Love Everyone: Kids Pride Heart Hoodie
$32.88
$32.88
This design uses the universal quantifier symbol (∀) and employs a pride heart design with the ubiquitous rainbow Pride Flag as a predicate symbol meaning "I love" or "is loved". It's a particular...
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Love Everyone: Logic Pride Heart Outline Hoodie
Love Everyone: Logic Pride Heart Outline Hoodie
$39.88
$39.88
Love Everyone: Logic Pride Heart Outline Hoodie
Love Everyone: Logic Pride Heart Outline Hoodie
$39.88
$39.88
This design uses the universal quantifier symbol (∀) and employs a pride heart design with the ubiquitous rainbow Pride Flag as a predicate symbol meaning "I love" or "is loved". We print this rain...
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Love Everyone: Logic Trucker Cap
Love Everyone: Logic Trucker Cap
$19.48
$19.48
Love Everyone: Logic Trucker Cap
Love Everyone: Logic Trucker Cap
$19.48
$19.48
This cap plays on symbolic logic, using the universal quantifier symbol and with a heart as a predicate symbol, saying "for every x, x is loved", or, "love everyone". The hat is a classic trucker c...
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Love Everyone: Trans Pride Heart T-Shirt
Love Everyone: Trans Pride Heart T-Shirt
$24.88
$24.88
Love Everyone: Trans Pride Heart T-Shirt
Love Everyone: Trans Pride Heart T-Shirt
$24.88
$24.88
A soft and lightweight T-shirt featuring a transgender variant of our "Love Everyone" design. This design uses the universal quantifier symbol (∀) and employs a pride heart design as a predicate sy...
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Love Everyone: Ally Pride Heart T-Shirt
Love Everyone: Ally Pride Heart T-Shirt
$24.88
$24.88
Love Everyone: Ally Pride Heart T-Shirt
Love Everyone: Ally Pride Heart T-Shirt
$24.88
$24.88
A soft and lightweight T-shirt featuring an allyship variant of our "Love Everyone" design. This design uses the universal quantifier symbol (∀) and employs a pride heart design as a predicate sym...
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Love Everyone: Logic Pride Heart T-Shirt
Love Everyone: Logic Pride Heart T-Shirt
$24.88
$24.88
Love Everyone: Logic Pride Heart T-Shirt
Love Everyone: Logic Pride Heart T-Shirt
$24.88
$24.88
A soft and lightweight T-shirt featuring a version of our "Love Everyone" design. This design uses the universal quantifier symbol (∀) and employs a pride heart design with the ubiquitous rainbow ...
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Law of Non-Contradiction: Logic T-Shirt
Law of Non-Contradiction: Logic T-Shirt
$24.88
$24.88
Law of Non-Contradiction: Logic T-Shirt
Law of Non-Contradiction: Logic T-Shirt
$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...
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Paradox of the Ravens: Philosopher's Camping Mug
Paradox of the Ravens: Philosopher's Camping Mug
$17.44
$17.44
Paradox of the Ravens: Philosopher's Camping Mug
Paradox of the Ravens: Philosopher's Camping Mug
$17.44
$17.44
The raven paradox notes that, at least formally, if seeing a black raven is evidence for the claim "all ravens are black", then so is any observation of anything that is neither black nor a raven. ...
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Begging the Question: Philosophy T-Shirt
Begging the Question: Philosophy T-Shirt
$24.88
$24.88
Begging the Question: Philosophy T-Shirt
Begging the Question: Philosophy T-Shirt
$24.88
$24.88
It's a phrase that is usually used in ways that make philosophers cringe. This silly shirt about the logical fallacy known as 'begging the question' is sure to get a reaction from those who know th...
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Paradox of the Ravens: Philosophy of Science T-Shirt
Paradox of the Ravens: Philosophy of Science T-Shirt
$24.88
$24.88
Paradox of the Ravens: Philosophy of Science T-Shirt
Paradox of the Ravens: Philosophy of Science T-Shirt
$24.88
$24.88
The raven paradox notes that, at least formally, if seeing a black raven is evidence for the claim "all ravens are black", then so is any observation of anything that is neither black nor a raven. ...
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