News for hackers. Stuff that matters.

A comment on Why Do Mirrors Flip Things Horizontally but Not Vertically? Here's the Physics. Parent comment

Re:Why Do Mirrors Flip Things Horizontally but Not Verticall... by SAI_Peregrinus on Wednesday October 07, 2020 @06:43PM (#24713677)
Parent poster forgot a critical condition for it to be a paradox. As they stated it's not, a second barber could shave both themself and the first barber.

The paradoxical statement would be "A barber shaves all those, and only those, who do not shave themselves. Who shaves the barber?" Without the second condition (only those who don't shave themselves) it's non-paradoxical.

[ Parent | on HN ]
Re:Why Do Mirrors Flip Things Horizontally but Not Verticall... by bigbubba on Wednesday October 07, 2020 @07:00PM (#24713819)
Replace 'A' with 'The' and it works. Tbh I assumed people were already familiar with the Barber Paradox and didn't word it defensively, but if you take 'a barber' as referring to a specific barber then it's a paradox.
[ Parent | on HN ]