r/mathematics

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Caesar cipher of 10 to decode

So I’m in y12 studying maths fm physics cs predicted A*. I want to aim for Cambridge maths or Cambridge cs. I’m already on track preparing for step and I do love maths. When I’m older I want to work in ai, it’s a field I have an interest in. Would a maths degree or computer science degree set me up for this. While I probably enjoy maths more I don’t know if it’s the best degree option for me. Let me know your opinions.

Everyone in this sub should’ve seen the question “6÷2(1+2)” or any of the variations by now. This question is ambiguous, all because of the use of the Obelus (or known as the division sign). There’s a reason why the Obelus isn’t used in higher level math, because it causes miscommunication, same with the multiplication sign!

What if, starting in elementary when we first learn about multiplication and division, we use the fraction bar and brackets to teach it? Wouldn’t that eliminate the future confusions for our children? As far as I know, some children (not all) have a hard time transitioning from the Obelus and multiplication sign to fraction bar and brackets. They would ask questions like “Why do we need a new way of expressing it if we already have a way?” Because they don’t understand the miscommunication it causes, teaching it in just 1 of the ways would be easier for them to learn, and using the way that causes the least miscommunications would make them not as confused as they are now.

If we just eliminate the multiplication sign and the Obelus completely, we wouldn’t have the problem with Implied Multiplication (not everyone understands it) or any of these ambiguous cases.

I think the world should consider doing this.

(Sorry if some of my words are confusing as English isn’t my first language and I’m still trying my best to make it sound natural and easy to understand)

I have to choose my next years modules and I can only choose one between DE and Statistics. I know Stats can be applicable in many fields and and is pretty employable but my God I find it so boring. On the other hand, DE is very interesting to me with its physics and real world aspect but I'm extremely scared of not being able to find a job later on because of it.

Did anyone here take DE and how did it turn out for you? I did a bit of research but I want to hear some actual experiences before making a decision. Any help is appreciated!

I really like computer science, but I'm also interested in maths. I wonder if the latter one may really benefit my first interest. I'm a senior in CE bachelor, and I want to get into maths for master in the next year.

I'm also curious about the jobs and where people actually end up. 🥸

hey guys quick story short i m a math major who unfortunatelymzde the choice to not follow game theory courses wich i kinda regret now and won t be studying it in the rest of my studies has any of you got good recommendation in game theory , books website videos or whatever ,appreciate it !

i had applier for computer science around jan, but ucd emailed me saying the slots for cs is full and to apply to other course. I applied to their mathematics course (MH62) Science: Mathematics (includes Applied/Financial/Statistics & Data (BSc) Science) Stream

i do have an interst in cs, but ig the rising ai would make it much more difficult to get a job in plain cs roles like software dev. But ig mathematics can boost your chances as you need all those statistical modelling, mathematics knowledge for model evaluation and training. I'd love to know if this is the right step or not.

Update - got an offer today for applied mathematics

Apologies if this is the wrong thread for this. But I'm hoping someone could impose some wisdom on me.

I currently have a 1st class hons in Mathematics from a non RG university. My degree was a mixture of pure and applied.

I have worked for 2 nearly 3 years in data analytics but realise that I want to do something more advanced. I also miss the level of mathematics I studied previously.

So, later this year, I will be studying a UK masters course. Currently, I have offers for 4 courses spread across 2 RG universities.

Mathematics x 2

Financial Mathematics

Mathematical and Theoretical Physics

As of my understanding, studying solely mathematics is a terrible idea if I choose to go back into a career outside of academia. however, my interests are very broad. I also decided that I want to use this Masters as an opportunity to build my understanding of interdisciplinary topics such as those in physics (quantum computing, for example) and finance.

for these reasons, I have been pulled towards courses that satisfy this.

My question is given studying a course called 'mathematics' implies only mathematics has been taught, is there any benefit to learning interdisciplinary topics like QFT in a mathematics course, if I wanted to move into a field such as quantum computing or will having studied relevent content in the course be sufficient to transition into such a field?

Hi everyone,

I’m trying to solve this geometry question and also wondering if my working format is acceptable for Cambridge O Level exams. This is not for homework. I'm trying to learn this for my mathematics o levels. i just want to know if this format is correct or not.

question:

ABCD is a parallelogram. E is a point on AB and EC = BC. Angle ECB = 40° and angle DEC = 60°. Find the value of x.

My solution:

Triangle ECB has EC = BC ∴ base angles are equal

Let base angles = x

x + x + 40 = 180 2x + 40 = 180 2x = 140 x = 70°

∠EBC = 70°

Since E lies on AB, ∠EBC = ∠ABC ∴ ∠ABC = 70°

Opposite angles in a parallelogram are equal ∴ ∠ADC = 70°

In triangle DEC: 70 + 60 + x = 180 130 + x = 180 x = 50°

Is this step-by-step method and notation acceptable for Cambridge O Level marking? And is my reasoning correct?

Thanks!

So recently I have had an interest in some trig identities that aren't the normal ones you see on a unit circle that you learn from back in high school. And I've came across some interesting identities that involve angles that aren't for 15°, 18°, 30°, 45°, 60° and 90° and their sum/different/half angle angles . More specifically some interesting ones where it uses more abstract identities such as sin(x)+sin(60°-x)+sin(60°+x) = (sin[3x])/4 & other interesting properties. Ones that stood out to me though were ones that used stuff involving angles such as (2pi)/7 and it kind of made me wonder about how if those are able to have a radical form for it's cosine & sine, then how would one construct those mechanically.

To explain further

cos(pi/7)×cos([2pi]/7)×cos([3pi]/7)=1/8

and cos([2pi]/7) & cos([3pi]/7) can be rewritten in terms of cos(pi/7) to make it moreso an algebric solution to look for when subbing in a variable for cos(pi/7)

So how could one work out how to construct cos(pi/7) for it's respective radical form?

https://preview.redd.it/h0t6gyzitctg1.png?width=993&format=png&auto=webp&s=587f3f92a34d27fb5a5945eccf0891a844ac4c83

https://preview.redd.it/7bncszkjtctg1.png?width=965&format=png&auto=webp&s=0585377e2d2bf247407be0c57c2461f4e5876712

https://preview.redd.it/c277u82ltctg1.png?width=1919&format=png&auto=webp&s=219724143019328a703bd99ecaec87433e35da61

So , recently I started to have some practical hours in physics and have to write protocols for my experiments.

When doing the diagrams i was frustrated by the lack of options for making a clean diagram, tried excel, canva, geogebra and all of theme were a nightmare for my use case, a simple logarithmic diagram with a fit line and some points.

So I took the mattter in my own hands and have written an python web app that does all the diagrams i needed, cleanly .

For anyone who is also frustrated from creating diagrams, you can check it out here: https://github.com/sharpclone/Graphik/tree/main

I appreciate feedback :) .

PS: im not a real developer! just an amateur. I vibe coded it together with my trusty friend, chatty.

I’m trying to place into Precalculus 1 at my university, but I have to pass a placement test first. The problem is, it’s been about two years since I last did any math, and I feel pretty weak in algebra right now.

I’m honestly not sure what’s even on the placement test, and that’s what’s stressing me out the most. I don’t know which algebra topics are actually important for precalc, so I don’t know what I should be focusing on when I review.

I know I can review effectively if I have a clear, organized list of topics But without a structured roadmap, I end up jumping around, getting stuck, and losing motivation because I don’t feel like I’m making progress.

Any suggestions? I’ve got around 4 months to study.

https://preview.redd.it/n69e7krqgbtg1.png?width=1891&format=png&auto=webp&s=5bbfb162ecd4dc58a3a767b1c490aabe9f767e45

What do you think?
https://www.desmos.com/3d/sjtcktwitg?lang=vi

Which books are best For Linear algebra, for practicing questions