Logic

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T-shirts, hoodies and other accessories with jokes and imagery about logic, the philosophical study of valid reasoning.
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Women’s Long Sleeve V-Neck Flowy Tee - deep heather
Begging the Question: Women’s Long Sleeve Flowy Tee
$24.85
$24.85
Women’s Long Sleeve V-Neck Flowy Tee - deep heather
Begging the Question: Women’s Long Sleeve Flowy Tee
$24.85
$24.85
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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Love Everyone: Mini Buttons (1'', 5-pack) - white
Love Everyone: Mini Pinback Buttons (1'', 5-pack)
$7.49
$7.49
Love Everyone: Mini Buttons (1'', 5-pack) - white
Love Everyone: Mini Pinback Buttons (1'', 5-pack)
$7.49
$7.49
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...
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Love Everyone: Large Buttons (2.2'', 5-pack) - white
Love Everyone: Large Pinback Buttons (2.2'', 5-pack)
$7.16
$7.16
Love Everyone: Large Buttons (2.2'', 5-pack) - white
Love Everyone: Large Pinback Buttons (2.2'', 5-pack)
$7.16
$7.16
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...
Add to cart
Love Everyone: Mug - white
Sale
Love Everyone: Rainbow Logic Mug
$9.49
$10.98
$9.49
Love Everyone: Mug - white
Sale
Love Everyone: Rainbow Logic Mug
$9.49
$10.98
$9.49
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...
Add to cart
Paradox of the Ravens: Philosopher's Camper Mug - white
Paradox of the Ravens: Philosopher's Camper Mug
$12.73
$12.73
Paradox of the Ravens: Philosopher's Camper Mug - white
Paradox of the Ravens: Philosopher's Camper Mug
$12.73
$12.73
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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Paradox of the Ravens: Philosophy Mug - white
Sale
Paradox of the Ravens: Philosophy Mug
$9.56
$10.98
$9.56
Paradox of the Ravens: Philosophy Mug - white
Sale
Paradox of the Ravens: Philosophy Mug
$9.56
$10.98
$9.56
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 - orange
Sale
Begging the Question: Philosophy T-Shirt
$19.98
$22.68
$19.98
Begging the Question: Philosophy T-Shirt - orange
Sale
Begging the Question: Philosophy T-Shirt
$19.98
$22.68
$19.98
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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Law of Excluded Middle: Logic T-Shirt - olive
Sale
Law of Excluded Middle: Logic T-Shirt
$19.98
$22.68
$19.98
Law of Excluded Middle: Logic T-Shirt - olive
Sale
Law of Excluded Middle: Logic T-Shirt
$19.98
$22.68
$19.98
Just the basics: This T-shirt carries a formula of symbolic propositional logic exemplifying the law of the excluded middle. In English, the symbols read as, for some proposition P, "either P or no...
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Unisex Jersey T-Shirt by Bella + Canvas - asphalt
Sale
Law of Non-Contradiction: Logic T-Shirt
$19.98
$22.68
$19.98
Unisex Jersey T-Shirt by Bella + Canvas - asphalt
Sale
Law of Non-Contradiction: Logic T-Shirt
$19.98
$22.68
$19.98
Just the basics: This T-shirt carries a formal symbolism for the law of non-contradiction in propositional logic. The formula reads as "not both P and not-P". For any proposition, P, it is a founda...
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