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@affiliate@lemmy.world
- Comment on Lasagna time 19 hours ago:
it will only be the strongest material in the universe until it gets boiled. trust me on this one
- Comment on The physics will continue until morale is improved. 20 hours ago:
if they invent some new kind of fucked up math to do it then there could be far reaching consequences
- Comment on Cursed Milk 20 hours ago:
“shittitest alchemist currently alive” has got to be one of the most challenging titles to hold onto for any serious length of time
- Comment on Existential trolley problem 22 hours ago:
you can always add an empty room without changing the total number of rooms, so there should be plenty of room for sisyphus and his boulder at the hotel
- Comment on Innovation 5 days ago:
this would be so Disruptive
- Comment on Zero to hero 1 week ago:
the standard (set theoretic) construction of the natural numbers starts with 0 (the empty set) and then builds up the other numbers from there. so to me it seems “natural” to include it.
- Comment on Checkmate, science 1 week ago:
what if you just attach a second magnet to the car so that it pulls the first magnet forwards?
- Comment on we love those power laws 1 week ago:
what were they doing for all that time
- Comment on checkmate, big geology!! 1 week ago:
unfortunately this would only work on tanks that shoot lava
- Comment on party poopers 1 week ago:
the teacher is the one doing the real lab experiment here
- Comment on cowabunga 2 weeks ago:
but can he grind on the topologists sine curve:
- Comment on Physics 2 weeks ago:
under an appropriate level of abstraction you can make lots of types of cylinders. in topology you can define a cylinder of a (topological space) X to just be X × [0,1]. this kind of definition comes up pretty frequently, and is used to create mapping cylinders, which i suppose are another type of cylinder.
the “normal” kind of cylinder is then just (circle) × [0,1], or (filled in circle) × [0,1], depending on whether you want it to look like an empty paper towel roll or a (full) can of beans
- Comment on You are in this solar system, but we do not grant you the rank of planet 2 weeks ago:
this condition makes “planetness” into a local condition. so theoretically, we can throw enough junk into space and stop anything we want from being a planet.
pluto just got unlucky in terms of the amount of trash it has in its way. its not fair :(
- Comment on I am the thing that goes *thump* 'Fuck!' in the night 2 weeks ago:
most horrifying thing is the bathroom being at the top of a flight of (carpeted) stairs
- Comment on just say no!! 2 weeks ago:
what if it’s not euclidean but only locally euclidean?
- Comment on Very understandable, have a nice day 3 weeks ago:
this is what i do when im feeling mischievous and want to annoy my family in the morning
- Comment on teachings 3 weeks ago:
i think this is a really clean explanation of why (-3) * (-3) should equal
9
. i wanted to point out that with a little more work, it’s possible to see why (-3) * (-3) must equal 9. and this is basically a consequence of the distributive law:0 = 0 * (-3) = (3 + -3) * (-3) = 3 * (-3) + (-3) * (-3) = -9 + (-3) * (-3).
the first equality uses
0 * anything = 0
. the second equality uses(3 + -3) = 0
. the third equality uses the distribute law, and the fourth equality uses3 * (-3) = -9
, which was shown in the previous comment.so, by adding
9
to both sides, we get:9 = 9 - 9 + (-3) * (-3).
in other words,
9 = (-3) * (-3)
. this basically says that if we want the distribute law to be true, then we need to have (-3) * (-3) = 9.it’s also worth mentioning that this is a specific instance of a proof that shows
(-a) * (-b) = a * b
is true for arbitrary rings. (a ring is basically a fancy name for a structure with addition and distribute multiplication.) so, any time you want to have any kind of multiplication that satisfies the distribute law, you need (-a) * (-b) = a * b.in particular,
(-A) * (-B) = A * B
is also true whenA
andB
are matrices. and you can prove this using the same argument that was used above. - Comment on He has to be stopped 4 weeks ago:
i can get up to 3 million on a good day
- Comment on Chicago Gang Rise Up 4 weeks ago:
is apa the one that makes you cite things in parentheses? because that one gets a thumbs down from me
- Comment on Dad is so cool 4 weeks ago:
how are you typing the “p”?
- Comment on pluto 4 weeks ago:
mee vee eee mee jee see uee nee pee
- Comment on pluto 4 weeks ago:
the more the merrier
- Comment on space 4 weeks ago:
then you’re in for a fun surprise
- Comment on pluto 4 weeks ago:
new planet definition is dumb and i don’t subscribe to it. pluto is always a planet as far as im concerned
- Comment on space 4 weeks ago:
if you believe in the notion that the universe is cyclic then you can mimic time traveling backwards by traveling forwards, past the end of the universe, and stopping at just the right time in the new universe.
e.g., to get to 1700 you’d go (present time) -> (death of the universe) -> (1700 in next universe)
- Comment on meow_irl 4 weeks ago:
yeah and what’s with all these wheelchair ramps and seizure warnings on stuff? i mean i don’t need a wheelchair ramp so i can’t imagine anyone else does either. not to mention handicap parking spaces
- Comment on Feels like Apple is more about fashion then tech IMO 4 weeks ago:
doesnt sound like it’s something that will be of much use to you, and thats fine. but i use it all the time to annotate textbooks and take notes when studying.
- Comment on Still wondering why people from Alaska didn't post about the eclipse 4 weeks ago:
trust me you dont want to know
- Comment on This thing 4 weeks ago:
regular tensors are tough enough, i dont even want to begin to know what ⊗^⊗^ means
- Comment on Feels like Apple is more about fashion then tech IMO 4 weeks ago:
i feel like it’s going to be another case of the ipad. i dont really remember anyone thinking the original ipad had a reason to exist when it came out (myself included). but after 8-10 years or so, it found a problem that it could solve (taking notes well, and being a general purpose school device). it’s not really necessary now, but it’s certainly way more useful than the original ipad was when it first came out.
i dont think the original vision pro will be that useful to anyone, but it might start a line of products that leads to something interesting in 8-10 years. or not, who knows.