siriusmart

joined 2 years ago
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[–] siriusmart 2 points 2 days ago (1 children)

what about this square, it does not have an inverse

1 1 1
1 1 1
1 1 1
[–] siriusmart 2 points 4 days ago* (last edited 4 days ago) (1 children)

was about to fall asleep but then PROPOSITION:

  • all magic squares are constant multitles (all numbers multiplied by a certain value), or shifted (all numbers added to by a certain value) of a very few variations of "base" magic squares this seems intuitively true by a sleepy deprived person at 1am, but if we can prove for these "base" squares, would that be the way to prove for the general case?

i.e. there r and infinite number of 1x1 magic squares, but there is only one case to deal with if we want to prove anytning about it

[–] siriusmart 1 points 4 days ago

this is actually interesting, im currently on bed so im not writing a proof, but the rule for a 3x3 magic square of conseqetive numbers seemed to be (tested on one other example) that its inverse is 1/(3*middle number), the 3 could be the dimension of the square?

if this is true, this begs the questions:

  • is it still true for squares of non conseqetive numbers?
  • what happens when the square is 4x4 where a centre number doesnt exist

either way im gonna have a go at it when i wake up tmr, and im pinning this for being one of the coolests finds in the community

[–] siriusmart 1 points 4 days ago (1 children)

of course the website has something to do with lean

633
submitted 2 weeks ago by siriusmart to c/memes
 
[–] siriusmart 4 points 1 month ago

CTRL + P and article mode enters the chat

[–] siriusmart 8 points 1 month ago* (last edited 1 month ago) (1 children)

when i first showed this question to my friend, he told me that f(x) = 0 satisfies the condition. It is incredible that he said this without delay (i have not thought of that possibility at all), but at the same time it made me wanted to explode,

[–] siriusmart 2 points 1 month ago* (last edited 1 month ago)

This challenge requires some specific knowledge on the topics, so if you have no idea how to approach this question, take a hint

Initial hintMaclaurin series: https://openstax.org/books/calculus-volume-2/pages/6-introduction


If you found f but not in the specific format

hintR formula: https://brilliant.org/wiki/trigonometric-r-method/


No hints on the extension, you are on your own.

 

Question

  • Find the function f such that f'' = -f
  • Show that the function can be written in format f = A sin(x + B)

Extension

Find a function g such that g'' = C * -g and

  • g(0) = D
  • g'(0) = 0 where C and D are arbitrary constants.

For those who have finished the extensionCongratulations, you have just derived the formula for objects in simple harmonic motions (physics).

[–] siriusmart 2 points 1 month ago* (last edited 1 month ago)

HintLine of greatest descent is the shortest distance between two contour lines.


I'm sure there are many other ways to solve this, as it is a very open ended question. But anyways this is one of the favourite proof i've done

Solution

17
submitted 1 month ago* (last edited 1 month ago) by siriusmart to c/dailymaths
 
  • Contour lines joins up points on a surface that are of the same height.
  • Field lines points towards the direction of the steepest descent.

As you may have noticed, whenever a field line and contour line crosses each other, they are perpendicular.

Prove it.

 

She literally said no

2
take on new LP songs? (self.linkinpark)
submitted 3 months ago* (last edited 3 months ago) by siriusmart to c/linkinpark
 

heres my current ops after first listen

Spoilerssounds amazing:

  • cut the bridge
  • overflow
  • stained
  • good things go

give it some time:

  • two faced
  • IGYEIH

no:

  • casualty

casualty after over each other is pretty cool

and just would like to say, good things go sounds like a mike shinoda song than LP

17
submitted 3 months ago* (last edited 3 months ago) by siriusmart to c/dailymaths
 

Yeah I can't lie, there is no calling this a daily challenge now.

Anyhow, have a go at proving this, I don't want any unrigorous "imagine zooming in until the line is straight" nonsense.

Difficulty: not a lot

Would appreciate if u put ur proofs or attempts below, I got a proof but it's like kinda mediocre.

[–] siriusmart 2 points 3 months ago

I've seen some people talking about the reason this song being pop is that all albums must have a radio song where almost everyone in the general public would accept. So my personal take while this song diverges from the classic LP style and the 2 previous songs, it doesn't really count towards the theme of the upcoming album.

I hope this song is just a show of "we can do this style" rather than "we will be doikg this style from now on", because I can already name a handful of pop songs with a similar style, and it kinda loses the point of LP.

[–] siriusmart 1 points 4 months ago

when i first heard it i thought it sounded like mainstream pop and didnt like it, but after hearing it a few more times, i starting to like it a lot, maybe not to the level of emptiness machine, still it good a cool rhythm and it vibes

29
submitted 4 months ago* (last edited 4 months ago) by siriusmart to c/israel_palestine_pol
 

In light of events following the previous post, it is almost certain shelling of the UN peacekeepers camp was not an accident from attacking nearby hezbollah tunnels.

The UN forces are the target of the Israeli army, as bulldozers usually dont accidentally show up in a warzone to specifically bulldoze a UN watch tower.

Oct 20 (Reuters) - The U.N. peacekeeping force in Lebanon (UNIFIL) said in a statement that an Israeli army bulldozer had demolished an observation tower and perimeter fence of a U.N. position in Marwahin in southern Lebanon on Sunday.
437
r u winning son? (lemmy.world)
submitted 4 months ago by siriusmart to c/memes
 
[–] siriusmart 3 points 4 months ago (1 children)

That would maybe make sense.

Yeah I think the claim might be true, but still there are probably ways to not hit a UN base of fixed location while carrying out an offensive.

This detail wasn't here this morning, the article is gradually edited as more info surfaced. See the url for the original title.

21
submitted 4 months ago* (last edited 4 months ago) by siriusmart to c/israel_palestine_pol
 

Their reasonings isn't making the slightest sense at all, so unless the article forgot to mention something entirely, this is rediculous.

Follow up post: https://lemmy.world/post/21092844

443
6.02 (lemmy.world)
 
 
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