Class Definition and 909 Threads

Let $\left\{ p_{1},p_{2},\dots,p_{h}\right\}$ a set of consecutive prime numbers. I want to show that, if $h$ is large enough, then doesn't exists a natural number $n$ such that $$n\equiv1\textrm{ mod }p_{i},\,\forall i=1,\dots,h.$$ I think is true but I have no idea how to prove it. Am I wrong?

Hello, for my degree I have to choose one of the two following classes. I am planning to pursue applied physics, specifically atomic, condensed matter or chemical physics. So, which should I take? 1) applied vector and tensor mathematics Introduction to vector and tensor mathematics with...

I just uploaded a post on the class SE of short exact sequences in Mod_R ... and tried to use Latex Code to achieve the same fancy script for S and E as Paul E Bland used in his text "Rings and Their Modules" ... but seemingly did not achieve the right script for S (E seems OK, or at least...

Hello, this is the metric I am talking about: $$ ds^2= (dt - A_idx^i)^2 - a^2(t)\delta_{ij}dx^idx^j $$ I never see one like this. How the metric tensor matrix would be?

Hello. I am in an undergraduate math major in an introductory graduate class on integration theory and it has truly been an unpleasant experience. I feel the instructor(who is teaching it for the first time) is pretty much completely disconnected from the students in his assignments and...

Homework Statement I have the following code (please see below). I want it to return [2,4,6,8,10] which is the function evaluated at the given list [1,2,3,4,5]. I want to do this using the process command. My problem is: print A returns [None, None, None, None, None] But I want it to return...

I'm about to take my first classroom math course and am kind of nervous about it. I'm good enough at math but very slow, this is why I have typically done online maths till now. I could take a week to do something I didn't comprehend. What tips can you guys give someone who is not quite as fast...

Hello people of the Physics Forums, this is going to be a bit of a long post, I apologize for that! I'm posting here to ask for some advice on how to prepare for my first sophomore-level modern physics class. I am feeling very nervous about this class because it is imperative I get top grades...

Hi, all. I want to become a Physics professor in the US. For a few years now I've been a TA in an american university and I've had to teach a few lectures to a large audience in a big lecture hall. However, american students learn differently. For moments, I feel like a performer in this...

Hello, For a school project I need to build a simple but working speaker. I am currently stuck on explaining how the signal amplifier works. Here is a schematic of an AB amplifier from Wikipedia. I have add a positive and negative sign indicating the connection of the battery. It contains 2...

Since this is about my analysis class, I think this is the right place to put this. So, I'm a couple weeks into my class in Mathematical Analysis, and the whole class is a cure for insomnia, and I don't even have insomnia. The textbook my professor assigned looks like they liked baby Rudin, but...

Hey guys, I really need help with this, I do not understand what I did wrong in this experiment. I had a 30 cm ruler as a beam and some weights of 50 grams, 5 grams and 25 grams. I had a fulcrum which was 17 cm high. As you can see I only have measurements in 50, 5 and 25 grams. So I cut out...

Trying to keep this as short as possible, I'd like to be an engineer, and I'm currently taking an algebra-based physics course. It's not a class I need for my major (of course, I will need calc-based), but I've already passed the drop deadline, so I'll receive a "W" on my transcript. It's been...

Homework Statement My problem is I don't understand what my professor wants us to do instead. He says that we don't need to memorize any equations, namely the equations of motion, and that everything can be solved with basic principles and integration. The problem is, I have no idea how to...

Homework Statement Hey guys, so I have been trying for the longest time to find the pattern in a hard-level logic problem with no success. I was wondering if someone on here could take a look at the problem and come up with the correct pattern. The variables involved in the problem are the...

This is strictly for math (but feel free to throw in other subjects if you like). Does anyone else really dislike math lectures and attending class? Do you get more enjoyment and/or productivity out of learning on your own (reading the book, working problems, etc.)? I know there are...

My school offers online courses and I'm considering taking one for Precalculus (to brush up on my skills before taking Calc.). My question is whether or not taking an online course for math of all subjects would be detrimental in anyway. I'm not even sure how it's structured (still awaiting...

Hi all, So far, I have taken two, non-calc based intro level Physics classes (101 and 102). I really enjoyed the material covered in both classes. For once, I actually enjoyed working through problem sets and I found myself researching topics outside of the classroom. I am seriously considering...

I've imported java.util, java.text and placed the following method under an appropriate class. I'm unable to pinpoint why compiler can't instantiate the type NumberFormat in my method's second line public static void tailorFormat(String name, double value, Locale loc){...

Here is my situation, I am a physics major who is also minoring in math. I have already taken Calc1-3 and Diff EQ as well as an intro to linear algebra course. I am scheduled to take a vector analysis course this Fall. The reason for my choice of linear algebra and vector analysis is because...

So, I have to choose between these two, on which to take first. Here are descriptions:

Hi there, fellow physics forums members & guests. I'm starting the 1st semester of grad school, and I'm faced with a tough choice between two different classes. I could take Intermediate Analysis 1 or Applied Linear Algebra. The only course I've taken involving proofs is Discrete Math...

hello, so I'm am currently about to attend CC this coming fall semester and my major is engineering. However, when i took the placement test i scored into intermediate algebra, which is a remedial class. I feel hopeless. I really want to become an engineer, but i fear that I'm not math-savvy...

Hello PhysicsForums Community! I have several questions regarding some possible class load schedules for this Fall 2014 term at the University of North Florida (UNF) for a double major in Physics and Mathematics. First, here is a little background about me: I am 19 years old and have...

I will try to be as objective as possible and not inflate my post with excuses. I am currently taking a college trig course, and I am doing badly--this might turn into a rant, so be forewarned. I am going to a CC where I have been doing well. My goal is to transfer to an UC and major in physics...

Hello i finished with a 3rd class honours degree in physics from one of the universities of london..I don't want to excuse myself..but since the start of the second term i had some health and mental problems which affected a lot my performance during the term and the examination period...I took...

Hi all, Isn't the mapping class group of a contractible space trivial (or, if we consider isotopy, {+/-Id})? Since every map from a contractible space is (homotopically)trivial.

1. Vehicle A and Vehicle B are moving in opposite directions on the NJTP. Vehicle A is heading south toward atlantic city while vehicle B is heading north towards Hoboken. In situation 1 and 2 described below, at t = 0s both vehicles are at a distance of separation of 400m and are moving...

for the class 100-199, the f (number of household) is 20, but in the histogram, the frequency is divided by 2 which 20/2 = 10 , but how can it show that in the class 100-199 , the total frequency of 100-199 is 10 ? when i look at the histogram, i would directly think that there are f=10 in the...

I'll assume that we all know of 1st, 2nd and 3rd Class Levers. Years ago I saw a brief remark in a magazine that I was browsing at the supermarket. It said that there was an obscure "4th Class Lever"—essentially what you get with a whip where the relative lengths of the Lever Arms are...

I figured out what the bug in my code is, but now I need to figure out how to best remedy it. Here's my function: function snake(C, C_h, C_w) { /* NOTE TO SELF: C is a Raphel object. Can't find a method to return the height and...

My friend's roommate is always so stressed out over school. He spends a ridiculous amount of time studying and always struggles to do well in his classes. It really bothers him. He asked me for advice a couple weeks ago, so we talked about it. We talked about his study habits and I found out...

Looking to build a zip line with 4% decline for the kids with: Class 2 50' CCA syp Class II telephone poles sunk 6.5ft. 3/8" cable 7x19 Galzanized cable for guy wire and zip line. 1st zip: 100ft Starting at 26ft on a 6' hill->Ending at 22ft 2nd zip: 120ft Starting at 22ft -> Ending at...

I registered for Heat Transfer, Fluid Mechanics, Mechanical Design I, and Vibrations in Mechanical design. I'm not sure if this is going to be too rough or not. Vibrations is an elective and I think it is important. Another option would be FEA. I'm in thermodynamics now and I enjoy it. I'm...

My college offers both online and offline math classes. I'm to the point now, where the math classes offered online are fewer, I need I believe up to calculus. I like the setup of online because I work like most people, and it gives me a week to complete homework and tests, rather than 2 days...

My school is on a quarter system so the calc series is divided into 4 quarters. I'm currently in my 3rd quarter of calculus which covers: This may sound like a dumb question but, should I take the 4th quarter of calculus next called "Vector Analysis"? Is this Calc III? It covers: Or should...

So, I am currently in an Advanced Calculus class (ie. elementary analysis of calculus). Our end project is to write a 5-6 page paper on a topic of our choice and relate it back to the class. A lot of the other students are economics majors so they are picking economic topics. I'm a physics...

Today I wanted to use my Windows phone to time myself doing a workout. After realizing that my phone doesn't have a stopwatch, I thought, "Oh, I'll make one." I've never made a Windows phone app before, but Microsoft has some documentation that should guide me later...

I need help -- urgently -- trouble with calculus class heyy everyone, I actually have a problem regarding calculus 1, I study engineering and its my first year I actually have always did reaally well in math in olevels but when I came to cal one don't know what happened basically ! I got a C...

I decided to make a library for some common data structures and I'm facing some design problems. I wanted to implement linked list using classes in c++. Here is the sample class:- class Linked_List { private: int key; Linked_List* next; public: Linked_List(int key)...

I am wondering if this class is senior undergrad level or graduate level. Here is a published PPT from the lectures of this class. http://bit.ly/1izPCIW The material is fascinating. I understand it enough to be intrigued, but I cannot unpack it all. Thanks, Chris Maness

Hello, I am working on a lab for school and I am having a problem. I am attempting to build a compensated class b power amplifier. I understand the common emitter configuration (to boost voltage) and the class b push pull amplifier stage (to boost current). I understand that diodes in the...

Hello! :) I have to find an equivalence class $[g] \in \mathbb{Z_{15}}^{*}$ so that each equivalence class $\in \mathbb{Z}^{*}_{15}$ is a power of $[g]$. $\mathbb{Z}^{*}_{15}=\{[1],[2],[4],[7],[8],[11],[13],[14]\}$ I tried several powers of the above classes,and I think that there is no...

Let's suppose i have a class of interval 7, say [20, 27[ With the numbers 20 21 22 23 24 25, there are 2 ways to derive the median yes? I may use [a+b[ /2 to get the median which in the case above will give me 23.5, or i may simply look at the numbers above and clearly see the median is...

I'm making a generic linked list class. For reference, [FONT="Courier New"]firstNodePtr and [FONT="Courier New"]lastNodePtr are pointers to the nodes at the beginning and end of the list. I'm trying to make a function that removes duplicate elements, which in turn calls a function for deleting a...

Hi all, Please tell me the class of this equation, and if possible how to solve this kind of equations: \Deltau(\vec{r})=F(u(\vec{r}),\vec{r}) Thanks in advance.

I am reading R. Y. Sharp: Steps in Commutative Algebra. In Chapter 2: Ideals on page 32 we find Exercise 2.40 which reads as follows: ----------------------------------------------------------------------------------------------- Let I, J be ideals of the commutative ring R such that $$ I...

Hi, I'm a Junior in high school. I just finished Calculus 3 (and got an A) last semester and I'm taking Differential Equations next semester. Also (if I get into this free math program), I will be taking Linear Algebra and Number Theory with Cryptology this summer. Anyways my question is what...

As I understand the ZFC solution to Russell's paradox, since {x|x\notinx} must be {x|x\notinx}\capS for some set S, the paradox goes away, but in Morse-Kelley, if I understand Class Comprehension correctly, although again there must be some M such that {x|x\notinx}\capM, this M may be a proper...

I am reading R Y Sharp: Steps in Commutative Algebra. In Chapter 3 (Prime Ideals and Maximal Ideals) on page 44 we find Exercise 3.24 which reads as follows: ----------------------------------------------------------------------------- Show that the residue class ring $$ S $$ of the ring of...