Search found 159 matches

by RogerMurdock
Tue Oct 18, 2011 6:42 am UTC
Forum: Mathematics
Topic: dirac delta functions on TI 89
Replies: 7
Views: 5055

Re: dirac delta functions on TI 89

I realize this is the maths forum, but TI calculators are extremely nifty for physics type calculations. Anything with a few simple derivatives, integrals, maybe a linear system or some matrix manipulation gets sped up 10x. I'm pretty good with an 89 and I KNOW it helps me on exams when I can quickl...
by RogerMurdock
Tue Sep 27, 2011 3:20 am UTC
Forum: Mathematics
Topic: How legitimate is this?
Replies: 10
Views: 3093

How legitimate is this?

http://www.cs.nyu.edu/pipermail/fom/2011-September/015816.html It appears this guy is saying PA is inconsistent and ZFC might be inconsistent? And he is from Princeton so not some random crazy guy. This contains the actual meat of his argument but I'm pretty sure it's not complete yet: http://www.m...
by RogerMurdock
Wed Sep 07, 2011 11:04 pm UTC
Forum: Mathematics
Topic: An interesting topic for a math talk
Replies: 8
Views: 2094

Re: An interesting topic for a math talk

Talk about foundational set theory and how it was formulated. Hilberts problems, big picture stuff.
by RogerMurdock
Sat Jul 02, 2011 6:30 pm UTC
Forum: Mathematics
Topic: Calculating N-th digit of Pi
Replies: 5
Views: 2484

Re: Calculating N-th digit of Pi

The idea was that I could just copy their calculated digits, calculate one more, then I would have the most accurate version of pi known to mankind. Of course I'm not seriously trying to do this, I'm mostly curious about the computational efficiency of calculating the n-th digit.
by RogerMurdock
Sat Jul 02, 2011 5:23 pm UTC
Forum: Mathematics
Topic: Calculating N-th digit of Pi
Replies: 5
Views: 2484

Calculating N-th digit of Pi

It's my understanding if you really want to know a specific digit of pi, you can calculate that digit alone. So what is to stop me from beating the "most digits calcuated" records by calculating the 2 bazillionth and 1 digit with my laptop and then claiming the record for myself? I looked ...
by RogerMurdock
Fri Jun 24, 2011 7:49 pm UTC
Forum: Mathematics
Topic: How practical is a B.S. in Math?
Replies: 20
Views: 7683

Re: How practical is a B.S. in Math?

This thread is surprisingly relevant. I am currently going into my sophomore year with a Math major and CS/econ minor. Though I was thinking about switching that to a focus in Finance/Statistics, I'm not sure now. My math degree is technically something like "Applied Discrete/Computational"...
by RogerMurdock
Thu May 26, 2011 11:53 pm UTC
Forum: Mathematics
Topic: Interesting Problems?
Replies: 33
Views: 4694

Interesting Problems?

I was recently instructed to come up with an "interesting problem", in math, physics, economics...basically any field. I'm the biggest fan of math and the people involved know this, so I was thinking of interesting math problems to present. I am looking for problems that: - Require no more...
by RogerMurdock
Mon May 02, 2011 1:30 pm UTC
Forum: Science
Topic: I'm doing science, and I need test subjects.
Replies: 79
Views: 10629

Re: I'm doing science, and I need test subjects.

Your test only lists two options for respondents' genders. I considered adding an "other" option, but I figured those who don't consider themselves male or female comprise a very small portion of the population, and I'm probably not going to block by gender anyway. I don't expect it to bi...
by RogerMurdock
Mon Apr 11, 2011 4:45 am UTC
Forum: Mathematics
Topic: Getting my undergrad in math. How about you?
Replies: 51
Views: 8184

Getting my undergrad in math. How about you?

Hello everyone! Though I am not very active on these forums, I have been reading them for a few years now and I do appreciate all the help you've given me answering questions and providing some very enlightening discussion. I am currently a freshman in university and had been having huge troubles de...
by RogerMurdock
Mon Dec 06, 2010 1:37 am UTC
Forum: Mathematics
Topic: In Linear Algebra, should I use my calculator?
Replies: 12
Views: 2445

Re: In Linear Algebra, should I use my calculator?

I feel your pain with the row echelon stuff. I understand the process and the theory completely, but for some reason the practice/test problems my college gives are insanely complex to do by hand.I feel like I'm not really doing linear algebra, I'm doing 4th grade addition. Halfway through, you're a...
by RogerMurdock
Thu Dec 02, 2010 7:44 am UTC
Forum: Mathematics
Topic: Forbidden subwords -- logic vs intuition
Replies: 13
Views: 1825

Re: Forbidden subwords -- logic vs intuition

I do this with most math/physics things I learn. I try to understand them at an intuitive level, so that next time I have a new problem I can look at it quickly and understand what is going on. Sadly, sometimes it's hard to communicate this desire to "really understand" what I'm learning t...
by RogerMurdock
Fri Nov 12, 2010 9:02 pm UTC
Forum: Mathematics
Topic: How difficult is a Real Analysis class?
Replies: 79
Views: 20394

Re: How difficult is a Real Analysis class?

I'm a freshman in University right now (Virginia Tech). For us almost all serious math courses are limited to second year. I'm in engineering currently, but may go into CS or a pure math degree. The basics of calculus (I & II), sometimes multivariable, extremely elementary linear algebra, and In...
by RogerMurdock
Tue Oct 19, 2010 4:14 am UTC
Forum: Mathematics
Topic: Why are linear problems "Solvable"
Replies: 4
Views: 1403

Re: Why are linear problems "Solvable"

Well perhaps the reason we study those things you listed so much is because they are linear? If all springs exhibited crazy nonlinear motion, they probably would be studied only in specialized scenarios when necessary. Imagine fluid flow was suddenly very linear and easy to study. You'd be in here l...
by RogerMurdock
Mon Oct 11, 2010 1:53 pm UTC
Forum: Science
Topic: Finding the coefficient of friction using a pendulum
Replies: 15
Views: 3023

Re: Finding the coefficient of friction using a pendulum

I'm having trouble conceptualizing how to solve this problem. I have a pretty basic physics background (in fact I'm sitting in a basic mechanics class right now), but wouldn't it be impossible to determine? The net force on the box while it slides down the ramp could be due to a variety of things. W...
by RogerMurdock
Sun Oct 03, 2010 5:37 pm UTC
Forum: Mathematics
Topic: I join the blagosphere
Replies: 28
Views: 2872

Re: I join the blagosphere

Sounds pretty awesome? I read your first entry and it was extremely interesting. I have a background in Calculus and knew some general ideas about sets but the entry was very informative and easy to understand. I probably actually *gasp* learned something.
by RogerMurdock
Thu Sep 16, 2010 1:16 am UTC
Forum: Science
Topic: please help me with this.
Replies: 21
Views: 3696

Re: please help me with this.

Having been on this forum a full year now, it's interesting to see the rise/fall of homework related topics and the subjects within. If aliens were receiving transmissions of purely the xkcd science forum, I have no doubt they could construct the curriculum of earth's introductory physics courses.
by RogerMurdock
Thu Sep 16, 2010 1:13 am UTC
Forum: Science
Topic: Teaching myself Physics-- textbooks?
Replies: 10
Views: 2055

Re: Teaching myself Physics-- textbooks?

If you're a math major you're probably legit at math and would laugh at some introductory physics texts. The first book you listed is like most physics textbooks out there...it's designed for the average student that doesn't put much rigor into their arguments and problems. The Kleppner book on the ...
by RogerMurdock
Mon Sep 06, 2010 3:23 pm UTC
Forum: School
Topic: My school fails at computer security...
Replies: 314
Views: 116243

Re: My school fails at computer security...

I had a really hilarious experience with my school near the end of my senior year last year. Basically they called me in on two different things, one was "skipping school" at the end of the day of a field trip, and the other was going to facebook. Facebook is blocked on the computers, but ...
by RogerMurdock
Mon Sep 06, 2010 5:53 am UTC
Forum: Mathematics
Topic: What should I be getting out of these classes?
Replies: 2
Views: 641

What should I be getting out of these classes?

I'm currently enrolled in a Vector Geometry and Linear Algebra course as a freshman at college, and unfortunately both classes are online (though I'm free to get in-person help if I want it). I don't have a textbook for either, just some sorta sloppily put together online resources that don't really...
by RogerMurdock
Sun Aug 29, 2010 12:25 am UTC
Forum: Science
Topic: Advice on career choice
Replies: 21
Views: 2962

Re: Advice on career choice

Once again thank you guys for the responses. I think I'm getting a better picture of what my options are at this point. The other night we were required to attend an engineering lecture from a pretty well qualified guy, and I figured it was going to be boring as hell. What do you know, he works on t...
by RogerMurdock
Thu Aug 26, 2010 2:50 am UTC
Forum: Science
Topic: Advice on career choice
Replies: 21
Views: 2962

Re: Advice on career choice

In the last half hour I also encountered the combination of math/econ majors. That would be pretty cool, since I find both of those subjects interesting and from what I read they can be lucrative if you hit it right. Either way I just want to do something for the next 4 years and in the rest of my l...
by RogerMurdock
Thu Aug 26, 2010 1:41 am UTC
Forum: Science
Topic: Advice on career choice
Replies: 21
Views: 2962

Advice on career choice

Hello everyone. I know a lot of you are fairly well educated and can draw from experiences about what I'm asking, I've decided to post here rather than the school board. Basically my situation is this: I'm a freshman at Virginia Tech in the Engineering program (literally just started this week). I g...
by RogerMurdock
Sat Jul 03, 2010 5:24 am UTC
Forum: School
Topic: AP Lang: Taking the test without the class
Replies: 25
Views: 4014

Re: AP Lang: Taking the test without the class

Epic bump. Got my scores back and I ended up with a 4. I ended up doing 0 practice tests and just had a brief conversation with an AP Lang teacher the day before, so I went into it basically blind other than the test structure. I was concerned for awhile since I used some cursing and referenced some...
by RogerMurdock
Thu Jul 01, 2010 9:32 pm UTC
Forum: Science
Topic: Low occurence of Boron in the universe
Replies: 8
Views: 1520

Re: Low occurence of Boron in the universe

A note on the \alpha\beta\gamma paper. That was written by Gamow and his student, Alpher. Hans Bethe got added because Gamow was a notorious trickster, the Feynman of his generation, and he couldn't stand that gaping hole in the Greek alphabet :) Which as I understood it, really screwed Alpher over...
by RogerMurdock
Mon Jun 28, 2010 5:53 am UTC
Forum: Mathematics
Topic: Math pick-up lines.
Replies: 15
Views: 2789

Re: Math pick-up lines.

I can see where it would be an interesting topic if presented in the right way. It is a powerful symbol that can be seen to represent several of the most important branches of maths together and the pieces involved aren't really mind shattering. I'm talking about the individual expressions in the eq...
by RogerMurdock
Wed May 26, 2010 4:24 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0745: "Dyslexics"
Replies: 143
Views: 48335

Re: "Dyslexics" Discussion

I'm probably just dumb, but where's the joke in this comic? I simply don't see any sort of punchline whatsoever. I'm going to assume you're being serious and possibly look like a prick-know-it-all-who-uses-too-many-hyphens there is a joke stating "Dyslexics of the world, untie" where it i...
by RogerMurdock
Fri May 21, 2010 3:33 am UTC
Forum: Mathematics
Topic: Question about infinite series
Replies: 9
Views: 1621

Re: Question about infinite series

I am in Calculus BC right now (or II, or whatever you want to call it it. High school calculus course part 2), and we learned about infinite series and sums and stuff earlier in the year, and I was wondering if the specific property I'm looking at has a name. Let me demonstrate. From what I can tel...
by RogerMurdock
Fri May 21, 2010 1:15 am UTC
Forum: Mathematics
Topic: Question about infinite series
Replies: 9
Views: 1621

Question about infinite series

I am in Calculus BC right now (or II, or whatever you want to call it it. High school calculus course part 2), and we learned about infinite series and sums and stuff earlier in the year, and I was wondering if the specific property I'm looking at has a name. Let me demonstrate. From what I can tell...
by RogerMurdock
Wed May 05, 2010 11:02 pm UTC
Forum: Mathematics
Topic: Largest [real] number, and smallest number greater than zero
Replies: 11
Views: 3018

Re: Largest [real] number, and smallest number greater than

1) The largest finite [real] number x is definied as the sum of all real numbers in the set of real numbers. How do you define a sum over an uncountable set? Even if you just sum over the natural numbers, it clearly doesn't converge and thus doesn't give you a finite number. I'll just point you to ...
by RogerMurdock
Wed Apr 28, 2010 12:32 am UTC
Forum: Science
Topic: GIS help
Replies: 11
Views: 1173

Re: GIS help

If i were you, I would just try going into the properties and "symbology" tab and fiddling with every option you see. This has become my general method of approach for most issues. I think I have some idea why you're having so many problems... I'm using ArcGIS, not sure what exactly that ...
by RogerMurdock
Tue Apr 27, 2010 4:17 am UTC
Forum: School
Topic: How badly will this hurt me?
Replies: 19
Views: 3774

Re: How badly will this hurt me?

You're a freshman, and if you're already making sure to get A's and B's, you'll be just fine throughout high school. The trick to HS is to get A's and B's your freshman/sophomore years, then you can slack off a little bit Junior or Senior year when you don't want to work as hard (or you can continue...
by RogerMurdock
Tue Apr 27, 2010 3:51 am UTC
Forum: Science
Topic: GIS help
Replies: 11
Views: 1173

Re: GIS help

I use GIS software in a brand new class at my high school, and I have to say this software is pretty damn annoying. It's useful when I'm not getting some sort of obscure syntax error, but most of the time there is some sort of minor problem like this that is close to impossible to fix. And for a pro...
by RogerMurdock
Sun Apr 25, 2010 7:26 pm UTC
Forum: Science
Topic: Explaining Magnetic Nonsense
Replies: 14
Views: 1706

Re: Explaining Magnetic Nonsense

I'm currently in an AP Physics class that doesn't do E&M and I'm trying to figure mathematically how fast the ball would fly off in that gauss rifle ruler demonstration. If I am correct, since electromagnetism is very similar to gravity in that it is an inverse square force, we could basically m...
by RogerMurdock
Thu Apr 22, 2010 2:55 am UTC
Forum: Science
Topic: So, quick question. (Earth stopped in its tracks)
Replies: 103
Views: 8991

Re: So, quick question.

Wow, something I can answer with some reasonable certainty. Gravity most definitely propagates at the speed of light, exactly. This was actually one of the major things the Newtonian view of gravity got wrong. They assumed back then that it simply propagated instantly (there is no good reason not to...
by RogerMurdock
Thu Apr 22, 2010 12:05 am UTC
Forum: Science
Topic: Colliding 2 Bodies (Physics)
Replies: 12
Views: 2012

Re: Colliding 2 Bodies (Physics)

Not sure how far I'm bumping this post, but we actually discussed this exact problem today in my AP Physics C class. The teacher attempted to solve it in front of us and stumped himself/said it was taking too much time and moved on. That got me curious though. We were attempting to do it through for...
by RogerMurdock
Fri Apr 16, 2010 12:17 am UTC
Forum: Science
Topic: Physics: conservation of energy question
Replies: 4
Views: 962

Re: Physics: conservation of energy question

This is a straight up forces problem. Conservation of energy or work don't enter into it. Your acceleration is going up the ramp (since the can is decelerating) and you want to know from that deceleration when velocity will equal 0. It can be done with Conservation of Energy though, and that's like...
by RogerMurdock
Sun Apr 11, 2010 9:56 pm UTC
Forum: Mathematics
Topic: Fundamental calculus?
Replies: 21
Views: 2854

Re: Fundamental calculus?

I like the limit definition better too, but I have never learned about the binomial theorem before now. I managed to work pretty good up till that step upon which I had to look up how to represent something like (x+y)^n appropriately. When would you usually learn this kind of thing? It seems pretty ...
by RogerMurdock
Fri Apr 09, 2010 3:06 pm UTC
Forum: Mathematics
Topic: Fundamental calculus?
Replies: 21
Views: 2854

Re: Fundamental calculus?

Thank you for all the helpful replies. I now realize that while what philip wrote was helpful, it doesn't help me actually derive integrals. I was wondering why x^2 ends up as x^3/3. So i'm going to try some stuff with limits and riemann sums here and see if I can get that on my own. I understand wh...
by RogerMurdock
Thu Apr 08, 2010 4:18 am UTC
Forum: Mathematics
Topic: Fundamental calculus?
Replies: 21
Views: 2854

Re: Fundamental calculus?

Thank you very much, that was actually a very good explanation. I think I already understood most individual parts of what you wrote, but the way you wrote them as one leading to the other helped very much. Is it bad that I can really only "get" proofs when they are explained similar to th...
by RogerMurdock
Thu Apr 08, 2010 3:10 am UTC
Forum: Mathematics
Topic: Fundamental calculus?
Replies: 21
Views: 2854

Re: Fundamental calculus?

I'm in Calc 2 so I'm very familiar with the fundamental theorem of calculus, but it doesn't really help me figure out how these ideas came to fruition. The example I picked was very simplistic but please don't get the idea that I just started with integrals, I'm asking these questions after 2 years ...

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