mathematok
Atok's Math Blog
My name is Janus, and I am a 25-year-old math-econ student at Aalborg University, Denmark
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The stereotypical complicated math equations scrawled on chalkboards in scifi movies must seem straightforward or BS to actual physics and math students.
#reblog#pretty much yea#some movies do an alright job#and actually hire a mathematician or physicist to devise a formula#example: the decay rate algorithm from the amazing spiderman#but in most movies it's painfully obvious that no one involved knows any math
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Funny how removing the context makes some things look silly 🤔
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Quick tip: x% of y = y% of x
For example, with x = 20 and y = 50:
20% of 50 is 10
50% of 20 is also 10
This holds true for any two real numbers x and y, and you can easily see why by simply looking at the definition of percentage:
#math#math tips#percentage#idk if this is too simple to be considered a 'tip'#but i remember when i was young and read it somewhere#and I thought it was pretty neat
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I’m bringing this blog back from the dead
It’s been like... 8 months since I last posted on this blog, whops.
Here’s what I’ve been up to since then:
Got my Bachelor’s degree in Mathematics-Economics!
Got a student job at a big energy trading company!
Started on my Master’s degree in Mathematics-Economics, specializing in Financial Engineering!
Passed all exams of the first semester!
Considering doing a PhD!
Moving in with my girlfriend in two months!
Feeling good!
I’d like to actually keep this blog more active from now on, as well as provide interesting posts (now and then), so I’m considering changing it up slightly by posting :
Updates from my semester project; I’ve been wanting to try making a summarized (perhaps interactive?), more accessible version of a project, to practice communicating math and data science
Updates from my courses; this semester I’m taking Data Mining, Quantitative Finance, and Bayesian Inference and Mixed Models ― maybe if we learn something particularly interesting, I could post about it
Stuff related to R (the programming language)
Ideas?
I don’t think I’ll have very much time for providing math help, so don’t expect immediate answers if you inbox me (you’re still very much welcome to ask questions anyway, of course).
But yeah, I’ll try to make more of an effort to post regularly.
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I’m on the 6th and final semester of my Bachelor’s degree, and this has been the most draining semester so far, god damn
I’m currently halfway through my exams; nailed both Time Series Analysis and Financial Engineering, but next up is Spatial Statistics, and I’ve not been this nervous about an exam since Analysis I...
It’s on Monday, wish me luck lol
#exams#the frequency of my posts on this blog is getting lower and lower#because im so god damn busy all the time#and i dont feel like i have anything interesting to post#T_T
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Theorem 7.2. It is NP-complete to decide whether a given target location is reachable from a given start location in generalized Pokémon in which the only overworld game elements are enemy Trainers.
“Classic Nintendo Games are (NP-)Hard“ [PDF]
Including such diagrams as Figure 23: XOR-Crossover gadget for Pokémon
(via rangi42)
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If you formalize those “GENIUS ONLY” posts, they kinda sound like textbook exercises from an intro course or something
#math#only for geniuses#which is apparently defined as#'can recognise simple number patterns'#i see those kinds of posts way too often#pls stop
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Why did the chicken cross the road?
The intermediate value theorem.
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Survived four hours in Purgatory (i.e. Partial Differential Equations exam) today
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wait is 5! = 120 an actual math thing i just reblogged it bc i sincerely believe that yelling a number makes it bigger
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A long overdue updated icon for this blog
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Multiplying large numbers in your head — explained
If you’ve seen this image:
(likely with comments such as “why didn’t we learn this in school!?”), perhaps you’ve wondered which numbers this would work for, and why.
It turns out to be a result of simple algebra that works for any two numbers, as long as you’re interpreting the method correctly.
The image explains very little, but algebraically here is what’s happening:
So with the numbers used in the image, it looks like
Basically, by expressing two numbers as a difference from 100, their product can be calculated in a way that’s easy to do in your head. Be careful though; from the image, one might thing you’re just concatenating the red and the blue parts of the number, but you’re actually adding them together.
As I said above, it works for any a and b. For example, we could choose a = 105 and b = 5 and get
That said, since the purpose is to make it easier to calculate, it’s limited which values this method is actually practical for.
Hence why they didn’t teach it in school :^)
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Why would you integrate a line integral with respect to a variable -- say, x or y -- instead of arc length? My book just kind of threw it out there and didn't explain where it came from. Maybe what I'm asking is what the geometric interpretation of it is? I don't know. (integrating f(x,y) dx vs integrating f(x(t),y(t)) dt along some curve)
Hmm, I’m not really sure, but it could sound like you’re evaluating something else than the line integral, since you’re fixing y and integrating only wrt x.
If this is for a course you’re following, I’d say ask the lecturer about it :/
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