9 ms·
straws have two holes. let's say you had a y split straw. does that have one hole or two holes or three?
by drenvuk 5y ago
straws have two holes. let's say you had a y split straw. does that have one hole or two holes or three?
- ddlutz 5y agoHow many holes does a donut have? What if you keep stretching the donut making it taller?
- grenoire 5y agoThree. A hole is a distinct pathway from one open end to another. A regular cylindrical straw is a torus at heart, it has only one way through. A Y-straw would have three paths from its three openings.
- karmakaze 5y agoThat's a question answered by the field of topology: genus 2. | | | +-- | +-- | | Look at it end on: __ //\\__ || ||_ \\// Now shorten the shaft of the right-facing hole so that it becomes a ring-hole on the right side of the end-on hole, then rotate it also so that it's an end-on view: //\\//\\ || || || \\//\\//
- drenvuk 5y agomade me go on a wikipedia dive. Thanks, I learned something.
- karmakaze 5y agoThe Vsauce video in sibling comment at 12:59 shows an animation from the two-rings to the T-shaped pipe, or even a better animation at 15:59. 12:59 https://youtu.be/egEraZP9yXQ?t=779 https://youtu.be/egEraZP9yXQ?t=779 15:59 https://youtu.be/egEraZP9yXQ?t=959 https://youtu.be/egEraZP9yXQ?t=959
- drenvuk 5y agoReplying to state that I'm wrong, mathematically.
- A_Venom_Roll 5y agoVsauce has a great video on this topic: https://www.youtube.com/watch?v=egEraZP9yXQ&ab_channel=Vsauce https://www.youtube.com/watch?v=egEraZP9yXQ&ab_channel=Vsauc... (don't worry, completely SFW)