# Math on Reddit News Feeds

• Where do you rank blackpenredpen?
by /u/Tonlick on August 6, 2021 at 3:54 am

On list of greatest mathematicians of all time. Many in the math community are claiming he is among the best. submitted by /u/Tonlick [link] [comments]

• How many 6mm BB’s can fit in a square inch? (not sure if im right)
by /u/JeronPlayz on August 6, 2021 at 2:38 am

I tried doing this. The radius is 0.118 millimeters from what I found. I attempted to use volume. 1^3 = 1 cube volume = 1 square inch sphere volume = (4/3)pi*r&3 equation = (4/3) * pi * 0.1181^3 = 0.00689829 1/ 0.00689829 = 144 ​ Is my math right? I get 144.9311 BB’s per square inch. submitted by /u/JeronPlayz [link] [comments]

• Is the probability of 3 consecutive birthdays the same as 3 random birthdays?
by /u/unholyverses on August 6, 2021 at 2:00 am

My siblings and I were all born one day after another (May 5th, 6th, and 7th), albeit years apart. This is usually my go-to “fun fact” whenever I’m forced to share one during icebreakers/first meetings. Today after I shared this during my summer orientation program, another guy interrupted to say that this isn’t that special, and that it’s basically the same odds of my siblings and I having any other random birthday. Would that be true? I’m still thinking that this would be rarer than non-consecutive birthdays, because each birthday would be conditional on the other birthday being a day prior, so the odds of it happening would be much smaller right? Or am I understanding probability completely wrong? submitted by /u/unholyverses [link] [comments]

• Combinatorics books suggestion
by /u/account_number_95678 on August 6, 2021 at 1:57 am

I’ve read “A walk through combinatorics” by Miklos Bona and find the exercise problems very interesting. Looking for books which have problems of similar difficulty, if not more. Thanks. submitted by /u/account_number_95678 [link] [comments]

• Quick Appreciation Post to my Professor
by /u/sauce4499 on August 6, 2021 at 1:53 am

• A Strangely Deep Problem about Sequences
by /u/AcademicOverAnalysis on August 6, 2021 at 1:08 am

• AMC Scores/College Applications
by /u/ExactDependent8 on August 6, 2021 at 12:42 am

I did well on amc + aime (barely missed USAMO). However, I’ve got very conflicting advice on how helpful this will be for college admissions (people telling me its roughly equivalent to USAMO, others saying its the same as any other AIME qual). What are your opinions on this? My top schools are Yale and Columbia (weird choices for math ik), does anyone know how they consider amc/aime scores? Before anyone mentions it, I know this isn’t completely mathematics based, but I asked a2c and other places and they had no idea (i.e comparing AIME to the math portion of the SAT is pretty inaccurate). submitted by /u/ExactDependent8 [link] [comments]

• If you prove a theorem is true under finite field arithmetic with n elements for all values of n, did you prove it holds true for regular arithmetic? What about modular arithmetic?
by /u/Threight on August 5, 2021 at 9:35 pm

This question came to me randomly and I can’t find anything on it from a quick google search. Intuitively I would say yes because if n can be arbitrarily large and the theorem stays true, then it should also be true if “n is infinite” (abuse of terminology) But also I’m sure I’m missing something that has to do with an obscure property of FFA or the repetitive nature of modular arithmetic that doesn’t exist in regular arithmetic. submitted by /u/Threight [link] [comments]

• Is there a direct way of calculating the divisors of n+1 having the divisors of n?
by /u/TECHNICALMCPLAYER on August 5, 2021 at 9:16 pm

I post this question here to discuss about methods of computing or approximating the divisors of n+1 knowing the divisors of n. Also, comments about properties of that divisors are welcomed. Please don’t post the well-known method of factorization, as my question isn’t about brute force and that method needs to take a large number of prime number for large numbers. If you have a proof of why is imposible to know these divisors or (if you dare) a proof of why is imposible to determine some properties of them, you are also welcome. submitted by /u/TECHNICALMCPLAYER [link] [comments]

• I could use some advice about ‘jumping back into math’ for college
by /u/Nintendo64Cartridges on August 5, 2021 at 8:41 pm

• Was majoring in mathematics worthwhile for you?
by /u/AidePast on August 5, 2021 at 7:37 pm

As an example: so many mathematics majors end up as programmers & so few people end up in a TT position, why are you not better off majoring in computer science & allocating mathematics to free time? submitted by /u/AidePast [link] [comments]

• The Poincare conjecture is a corollary of row reduction (Yes, really)
by /u/DamnShadowbans on August 5, 2021 at 7:13 pm

by /u/ataket1 on August 5, 2021 at 5:24 pm

I’m studying Bachelor Mathematics at the TU of Munich. I recently got a below average note in an Abstract Algebra course that I loved. I’m pretty bummed out about it. I thought I had understood the concepts quite well, and after reviewing the exam my mistakes were quite obvious to me. So I’d like to ask: How important are grades in contrast to actually understanding the material? I’d appreciate it if you could also provide your own university/grad school experiences regarding this topic 🙂 submitted by /u/ataket1 [link] [comments]

• What’s your favorite integer and why?
by /u/5minusone on August 5, 2021 at 5:05 pm

I see the “favorite number” question passed around every now and then, but I’m gonna ask with integers, cause there are a lot of neat little quirks that some have that go unnoticed. Personally, 0 is my all time favorite. There’s just something that’s so satisfying about “n-n=0.” 0, being the numerical manifestation of nothing, is completely neutral, and is the additive identity, being invisible in a sense. Its rules are simple, but is one of mankind’s greatest inventions. I also like 36. It’s triangular, antiprime, and square; what’s not to love? submitted by /u/5minusone [link] [comments]

• Does poor spatial ability impair learning math? How do I improve it?
by /u/dudeydudee on August 5, 2021 at 5:03 pm

As I’m studying math and coding, the syntax of equations and logical statements are more or less okay. But when it comes to graphing, visualization, and representations of concepts I get lost. I think I underestimated the importance of these things for learning math. I also have a terrible sense of direction and other poor spatial awareness so it might be my brain lol. What are some tactics for overcoming this deficiency? submitted by /u/dudeydudee [link] [comments]

• Career and Education Questions: August 05, 2021
by /u/inherentlyawesome on August 5, 2021 at 4:00 pm

• Is the hexagonal tiling the most efficient tiling if we allow for non-regular tilings?
by /u/Rare-Technology-4773 on August 5, 2021 at 3:41 pm

The honeycomb conjecture from this wikipedia article has as a condition that the shapes which make up the tiling are “all of unit area”. If we require them instead to be “on average of unit area” does the optimal tiling change? submitted by /u/Rare-Technology-4773 [link] [comments]

• PhD in numerical analysis
by /u/EthanCLEMENT on August 5, 2021 at 1:34 pm

Hi everyone, I am in my last year to complete my master’s degree in machine learning. However, I took a class in numerical analysis last semester and I truly enjoyed it. I am good at math and I can code decently but my math background didn’t go farther than calculus 3 and linear algebra ( I took differential equations too ) and numerical analysis seems to be very math heavy at least to enter the PhD programs. I was curious if it was realistic/ possible to do a PhD in numerical analysis despite my obvious lack of skills in analysis and math at the graduate level in general. submitted by /u/EthanCLEMENT [link] [comments]

• Probability of Coin Flip Subsequences
by /u/rain5 on August 5, 2021 at 11:16 am

• problem-solving oriented group on Automata, Languages, and Complexity
by /u/xTouny on August 5, 2021 at 7:12 am

Hello, This post is an announcement of forming a collaborative group for solving problems related to Automata, Languages, and Complexity, which are usually at an introductory theory of computation undergrad course. The focus is on solving problems not reading for the first time. We hope members share their insights, approaches, and strategies together. Sharing even partial progress is welcomed as others might contribute upon it. As we believe everyone’s time is limited, The group will take a week-based iterative approach for communication, So that you don’t need to check new messages every 5 minutes. This is an excellent chance for members interested in theoretical computer science to form new connections and friendships, Especially that we will be challenging everyone’s skills by tackling non-trivial problems. A seemingly good candidate for the problem set is Du & Ko’s book Problem Solving in Automata, Languages, and Complexity, who authored Theory of Computational Complexity as well. The only requirement is basic mathematical maturity and a familiarity with Sipser’s introduction. Members coming from pure math background are welcomed, but they will be asked to self-study the materials on their own. If you are interested send me a direct message here on reddit. All feedbacks are welcomed. submitted by /u/xTouny [link] [comments]

• Is it too late for me to move to quantum cryptography?
by /u/edwardshirohige on August 5, 2021 at 6:24 am

I’m a final year masters student and I’ve started appying for PhDs. I took a crypto course last sem and I really liked it. I’ve been attending a school on quantum crypto and I’m loving it. Is it too late for me now? Most of my summer projects have fortunately been on the mathematical side of Quantum Information Theory. To be specific, I wanted to ask if profs and institutes will take my applications quant crypto PhDs seriously. The issues I see are that I don’t have a strong physics background, only a few basic courses(including one on quantum mechanics.) My CS background is decent at best and my masters thesis is on operator algebras, which is very much unrelated to quantum cryptography as far as I know. (There’s Non Local games that have some applications to QKD and non local games require a fair bit of operator algebras and I fortunately have done a reading project on that. ) My recommendations are also going to be from people working on operator algebras and related fields. What do I do from this point? Any advice? submitted by /u/edwardshirohige [link] [comments]

• Motivation for Topology
by /u/acantholysized on August 5, 2021 at 1:11 am

Perhaps this is the wrong subreddit, so forgive me if it is (and please point me to where I should post this). I am working through Munkres’ Topology (with Mendelson’s Introduction to Topology for reference for point-set topology), with the goal to become familiar with algebraic topology. I’m struggling to move forward, in a somewhat existential manner: what is the motivation for learning algebraic topology? My original interest came from a desire to reason about things visually (geometrically), but using the power of algebraic structures to do so. I came to algebraic topology and was interested in its relation to algebraic geometry (and here I could be completely misunderstanding how the two fields relate). Put another way, my motivation to learn is stemming from wanting to study things “visually” and algebraically, and I fear I may be putting my effort in the wrong direction. I apologize if this is a rambling comment, I will reply to comments that request clarification of my situation. Thank you :). submitted by /u/acantholysized [link] [comments]

• Lecture 1: Gauge Theory for Nonexperts (Timothy Nguyen)
by /u/IamTimNguyen on August 4, 2021 at 4:46 pm

• Quick Questions: August 04, 2021
by /u/inherentlyawesome on August 4, 2021 at 4:00 pm

• Australian mathematician discovers applied geometry engraved on 3,700-year-old tablet | Archaeology
by /u/Nunki08 on August 4, 2021 at 3:34 pm