yuuki @yuuki26

i’m currently researching the Euclidean algorithm

function gcd(a, b) {
if (b === 0) {
return Math.abs(a);
}

return gcd(b, a % b);
}

but haven’t figured it out yet.
seems this can also be applied to polynomials n is related to Bézout’s identity etc., tho.

posted at 11:06:05

bear’s basking in the sun on my table

posted at 08:24:17

actually it was 12,000 JPY.

from now on i’ll tweet ¥100 as $1 for the best understanding.

posted at 06:41:16

bought a Nitori gaming floor chair $120.
☆☆☆☆
this isn’t supposed to be put on a mattress.
hard n uncomfortable.
all i rlly wanted was a backrest. https://pic.twitter.com/KTWZ3wJO1n

posted at 06:21:07

slept today too
slept at 20:00 woke up at 4:00

posted at 05:50:38

2023年10月22日(日)4 tweetssource

still no Scizor, Absol, etc. (no Metagross, Lucario, or Galarian Darmanitan either.)

posted at 18:44:21

When I started this acc 2 yrs ago, I wanted Charizard.
And now I have 5.

- Fire Spin/Blast Burn*
- Dragon Breath*/BB*/Dragon Claw
- Wing Attack*/BB*
- Ember*/BB*
- Air Slash/BB* https://pic.twitter.com/9TX8Wbvp67

posted at 18:06:58

i’ve tons of persimmons in the fridge for a month n they’re totally fine.

posted at 15:12:53

i’ve basically only got meat n onions

posted at 15:00:46

2023年10月21日(土)14 tweetssource

Anime i recently watched
2022
- kiki’s delivery service
- the tale of the princess kaguya
- re:zero s1
2020
- detective conan all eps
2019
- tokyo ghoul s1-3
- demon slayer s1
2017
- age 12 s1-2

posted at 18:30:31

It’s been 7 yrs since i decided to watch Your Name.
heard it’s a fad.

posted at 18:29:37

or at least 3, to play the game of life.

posted at 17:16:12

i want 10 friends to play a game of werewolf (aka mafia).

posted at 17:14:09

i’m currently organizing my research.
https://min.togetter.com/id/yuuki26

posted at 11:04:00

this is called a generating function n was discovered by de Moivre in the 18c, according to wiki.

seems using aₙ = aₙ₋₁ + aₙ₋₂, it follows
𝑓(x) = x/(1 - x - x²).

n some reasoning leads to
aₙ = (ϕⁿ - (-ϕ)⁻ⁿ)/√5.

posted at 10:28:19

• Recurrence relation
seems one way to find an exact formula for a sequence like
aₙ = 1, 1, 2, 3, 5, 8, …
is the “inverse of the Taylor expansion.”

its known that
eˣ = 1/0! x⁰ + 1/1! x¹ + 1/2! x² + …,
but the idea is to find 𝑓 such that
𝑓(x) = 1x¹ + 1x² + 2x³ + 3x⁴ + ….

posted at 10:04:41

0.999…=1 is obvious if the lhs is viewed as a limit.
there’s no doubt that 0.999… is getting closer to 1.

posted at 08:59:41

• Limit
lim[x→∞] f(x) = L
basically means that the point where the value gets closer (as x gets larger) is L.
nothing more, nothing less.
not smtg like “equals L after infinite steps.”
(idk if such an interpretation is possible in higher math.)

posted at 08:59:26

• Consider drawing a figure using only a function that draws a point (x,y) on a plane, say, drawPoint(x,y).

considering drawing a line leads to the equation of a line.

considering drawing a circle leads to trig functions.

posted at 07:53:52

however, it was discovered that this can be interpreted as the point (x,y) being moved to (e,f) by the matrix ((a,b),(c,d)). (by Cayley in the 19th century, according to wikipedia.)

so matrix multiplication represents the composition of maps f∘g, and so on.

posted at 07:33:44

My current understanding of mathematics.

• Matrices are linear maps.
matrices were historically just a notation for simultaneous equations with coefficients and variables separated.

e.g. writing

ax + by = e
cx + dy = f

as

(a b)(x) = (e)
(c d)(y) = (f).

posted at 07:33:11

deleted my ts complex number class.
(archive) https://web.archive.org/web/*/https://raw.githubusercontent.com/yuuki15/Complex.js/main/%2A…

posted at 05:01:59

i forgot my ROG Phone 5s Pro (2021–2023)

posted at 02:57:24

2023年10月20日(金)7 tweetssource

i signed up for Rakuten Mobile n got a Rakuten Hand, then MNP’d to Y Mobile, got an Oppo n cancelled immediately.

posted at 12:30:32

I bought Rakuten Hand 5G for $10 n Oppo A55s 5G for $20.
(i never use multi acc. just use the same acc on multi devices.) https://pic.twitter.com/JXoSECPXsS

posted at 12:10:50

please refer to my channel for details.
https://www.youtube.com/@yuuki15

posted at 10:41:11

reposting my face for new ppl https://pic.twitter.com/AHUZbLHZnV

posted at 10:35:43

i’m ngsb.¹ i never drink or smoke. my trainer level is 50. things i didn’t include.

¹ no girlfriend since birth

posted at 09:33:55

i mean, it’d be nice to know what background ppl r tweeting from.

posted at 09:05:19

Created my biodata.
𝕏 should’ve this feature so we can see what ppl r using in the iphone vs android war.
https://docs.google.com/spreadsheets/d/1hxW9GeBESb7CE66FCfcD5RXLQYIQsioALn0hLodsZsc/edit… https://pic.twitter.com/sRp0uKah2O

posted at 08:45:29

2023年10月04日(水)14 tweetssource

there was a point where a lot of water was coming out js for the record (tama hibiki [gem sounding] falls) https://pic.twitter.com/pFbOCgYTXG

posted at 16:12:08

conclusion: speleology is hard. i still havent figured out what a limestone cave is. it could be commercial caves arent interesting.

posted at 15:28:38

the sign at the entrance said no photography but i js found a review that said they were told photography was allowed

posted at 15:08:46

on the other side of the roadway was the Ryūsen New Cave Science Museum, where photography was prohibited.
this was another cave, more academic.
https://maps.app.goo.gl/iqKCJSqWvxi4GLrD6…

posted at 15:02:33

at the end, there was a way back up the stairs to the entrance. do not take video while climbing stairs https://twitter.com/i/web/status/1709442966753104022… https://pic.twitter.com/aewMXx6rmh

posted at 14:38:57

the passage was narrow but solid n there were several wheelchair users.

posted at 14:37:06

glad i hadnt received my iphone 15 yet i couldve dropped the phone.

posted at 13:47:43

seems most ppl visit to see such blue lakes. https://pic.twitter.com/CwtTgcRwWH

posted at 13:39:36

seems it was ~15c (59f) near the entrance n ~10c (50f) at the back.

posted at 13:24:34

so ryusendo was full of exhibits with no scientific explanation, like this “cave venus.” https://pic.twitter.com/AtH1Oc9L86

posted at 13:18:23

the second exhibit “the outline of ryusendo cave” and “bats of ryusendo cave.” https://twitter.com/i/web/status/1709411771109556275… https://pic.twitter.com/PhxYHx1Tk4

posted at 12:35:00

the first exhibition “the abyss of longevity.” https://pic.twitter.com/5MbiHKNyrd

posted at 12:09:55

from the entrance to the first exhibition.
the floor was wet. it was cold.¹ the passage was narrow.

¹ the inside was 16 c (61 f) while the outside was 19 c (66 f). https://pic.twitter.com/LeGlGSqeY3

posted at 11:46:39