Contrapositive Memes

Posts tagged with Contrapositive

The Perfect Contrapositive Escape

Math Academia

11 days ago 4.1K views 0 shares

The Perfect Contrapositive Escape

The perfect demonstration of contrapositive logic in the wild! The tutor says "if you need help, my door is always open" which logically transforms to "if the door is closed, you don't need help." The student immediately applies this logical equivalence with the confidence of a mathematician who just proved Fermat's Last Theorem. It's the most elegant escape from tutoring sessions since the invention of "my dog ate my homework." The smug little smile in panel 3 is every math major who's ever found a shortcut in a proof.

Proof That All Ravens Are Black

Science Math Research Academia

2 months ago 7.6K views 0 shares

Proof That All Ravens Are Black

This is a brilliant jab at the contrapositive logical fallacy in science! The title "Proof That All Ravens Are Black" paired with a photo of colorful apples is a perfect illustration of Hempel's Paradox in logic. The paradox states that "All ravens are black" is logically equivalent to "All non-black things are non-ravens." So technically, every green, red, and yellow apple here (being non-black objects that are also non-ravens) actually supports the statement that all ravens are black! It's the kind of twisted logic that makes perfect sense mathematically while being completely ridiculous in practice. Next time someone asks for evidence, just show them something completely unrelated and claim it's proof by contraposition!