Count Definition and 159 Threads

In the comum sense, the number 10 is the base of the decimal system and is the more intuitive basis for make counts (certainly because the human being have 10 fingers). But, in the math, the number 10 is an horrible basis when compared with the constant e. You already thought if an irrational...

http://arxiv.org/abs/1404.1750 How many quanta are there in a quantum spacetime? Seramika Ariwahjoedi, Jusak Sali Kosasih, Carlo Rovelli, Freddy P. Zen (Submitted on 7 Apr 2014) Following earlier insights by Livine and Terno, we develop a technique for describing quantum states of the...

Homework Statement I had a different problem before about this and I figured it out. I'd like to know if I'm doing this one correctly as well. Count the number of automorphisms in the graph. The graph is attached, now.The Attempt at a Solution I know I can rearrange the (a,m,b) 3! ways. I...

Homework Statement Consider the n x n matrix A = diag[1,3,1] and vector x: (1,2,3) Determine the number of operations needed to compute the LU decomposition of this n x n matrix. The Attempt at a Solution So for a general n x n matrix, my prof's notes say that LU decomposition...

If the radiation flux is calculated as: F = \frac{L}{2*pi*r^{2}} where L is the luminosity of the source and r is the distance from the source and the count rate of a scintillator \frac{number-of-scintillations}{time} What is the relationship between them? There obviously should be one, as...

I am in a lab class and we are currently measuring count rates for a specific source. Yesterday we ran a program that runs 3 second gate times on a CS-147 source with a voltage of 500v running through the detector, and a threshold of .5v on the counter. This 3 second gate time was to be repeated...

Hi guys and gals, first post here, but I've lurked here before but just now registering and posting I'm getting ready to apply for my graduate schools. I'm not sure what exactly I'm seeking, so I want to provide a little background. I've always been a tinkerer, ever since I was young I've...

Homework Statement Fidn the total multiplications and divisions needed for the LU Decomp. of a general n x n matrix A, whose entries satisfy a_{ij} = 0 if j ≤ i - 2 Assume n=5. Also f ind the total multiplications and divisions needed for solving the lower triangular system Lg=f and for...

Homework Statement Find an orthogonal transformation ##\mathbb{R}^{3}\rightarrow \mathbb{R}^{3}## that map plane ##x+y+z=0## into ##x-y-2z=0## and vector ##v_{1}=(1,-1,0)## into ##(1,1,0)##. Count all of them! Homework Equations ##A_{S}=PA_{0}B^{-1}##The Attempt at a Solution So basis...

I have a data file with 21 values in it, which range from 2 to 10 by integers values. I would like to know whether it's possible to write a Fortran code to count the number of times a particular value (for instance "6") appear in the file. Let's call x_i the number of times the value i appears...

Homework Statement Let there be 2 boxes U1 and U2. Box U1 contains 3 red balls and 4 black balls. Box U2 contains 5 red balls and 3 black balls. We chose at random from one of the boxes: -If it's a red ball from U1 we put it in U2. -If it's a black ball from U1 we put 2 black balls in U2. -If...

Homework Statement calculate the rank order correlation between the following data: 6, 5, 4, 2, 3, 3, 8, 3, 7, 6, 7, 5, 5, 4, 2, 7, 6, 2, 4, 6 4, 3, 6, 7, 6, 7, 1, 9, 1, 2, 3, 4, 5, 5, 7, 1, 2, 9, 5, 4 Homework Equations Following the output from...

Homework Statement I've attached the problem sheet and my attempt at the problem. I've completed all the parts except for the last part, where I have to calculate the count rate of the radioactive source. The answers should be 6000 counts for 185MeV and 4650 counts for 1MeV. I'm not sure...

Hi, I'm writing a program for nqueens where inputs will be n and possibly a few existing queens already placed on the board. So far I've come up with one method, but got stuck on the second one. (hoping second method is more efficient) 1st method: - tabulate possible outcome of (n*n...

Homework Statement Calculus question about tag and recapture? Here is the problem, i tried to do most of it but don't understand what its asking on c and d. Tag and recapture is used to estimate populations of animals in the wild. First, sample of animals are captured, number=n. They are...

Hey guys, I have a question. I recently did an English test and passed it, and because that exam, I'm exempted from taking the English course (which is compulsory for the degree), but I passed it with a B and I'm worried that it would count in my GPA. My college says it won't count on it, but...

Coincindence Count Rates ! I have two particle detector, 1. one will counts 13 particle/sec 2. second has 0.138 particle/sec (i.e. 1 particle can be detected in 7.2 sec in second det) what will be the probability of both particle being detected ? and in how much time ?

I was just checking out coursera and some others and noticed there many advanced classes available. If completed, how much weight would this carry in an interview or generally on a CV? Would this be considered fluff? Obviously, we are in a transitional period with traditional education...

I have not read any formal (mathematical) explanations of black hole thermodynamics, only popular literature on that subject. I have read that the total amount of information, and therefore its entropy, that a black hole can contain is proportional to the area of its event horizon (measured...

I’m wondering if that is some kind of unscientific thinking masquerading as scientific thinking. Does the thinking appear to be scientific but is, in fact, faithless to science’s basic values and methods?This definition is indebted to Sagan, The Demon-Haunted World, p. 13. Because...

Hi, I am a student in theoretical/fundamental physics that finished his masters couple of weeks ago. I'm still looking for a PhD starting asap. I am quite interested in an opened position at a UK top 10-15 university, the project seems interesting enough to invest 3 years in it. But I have...

My word count right now is around 1200 words. Some applications say 1-2 pages, or "briefly describe x y and z" which my statement definitely falls into (slightly less than 2 pages). None of them explicitly give a word count, but I'm worried that I should still try to keep it under 1000 words...

Count from "MatrixForm" in mathematica! Hi every one, I really need help on this task.. how do I Count only the zeros elements from a MatrixForm in MATHEMATICA Suppose I have a Matrix 100X100 full with numbers and I just need to know how many zero is there on this matrix thanks

So, I was thinking a lot about different ways to order the irrationals. Most of them had to do with infinite-dimensional row/columns, but nothing was really working (obviously - as if I'm going to prove Cantor wrong LOL). However, despite the clear history against me, I'm wondering if it's...

Homework Statement I currently am confused about a, probably, simple problem >.< Back in primary school and middle school, my science teachers taught me that one of the simplest examples of a wheel and axle would the the wheels of a car (in this case a toy one), which made sense to me at the...

Homework Statement I have a thousand random numbers generated between -100 and 100 and want to count the number of occurences of each integer. I know i can use the COUNTIF function, but for so many numbers it takes way too long. Is there a way to create a loop in excel that can do this or...

Question- How many zeros are there in the product of all the natural numbers right from 1 to 1962 or in short in 1962! ? Attempt- Well, The product as a product of prime numbers, will denoted as - Let the product be N, [SIZE="4"]N = 2a1 . 3a2 . 5a3 . ... pax As far as i see it we...

I'm trying to find the most intuitive way to count to 20 using only the fingers of your hands. Right now my favorite is using 4 fingers on one hand to count groups of 5 from the other. Any other ideas? Please participate! :smile:

It's not that I discovered a way to count it or anything, but I think I have some confusion about it. I understand that Cantor set isn't countable and I accept the proof also. But, what if we count the elements of the set like the following? 1, 0, 1/3, 2/3, 1/9, 2/9, 7/9, 8/9, 1/27...

say you are multiplying integers from 1 to 1000 and you want to count the number of "unique" elements. How would you do that? Is there a closed form expression for that? counting the unique or non-unique elements is the same since we know the total number of elements and can get the unique or...

Homework Statement Hello all, I have the following logic gates: (A'.(B+C))' which I had reduced to A+B'.C'. I then want use a NAND gate connected to a NOR gate, then connected to an inverted. However, I have been informed that I need not to use ten transistors, and that 8 can get the job...

Hello, i need information who know or advise where i can to find literature, how to caltucalate this. 1. I need information how to caltucalte load (snow, wind and other forces) which can keep this roof, and 2. how to choose dampers which keef roof. Maybe anyone know how to calculate this...

Uh... what do I say now? Do I repeat it, like a dolt? Why do pedestrian crossing signals count down then the traffic light stays green?

Homework Statement If we have ker(T)={0}, why is the dim(ker(T)) = 0? Does the 0 vector not count when determining the dimension? I thought the answer would be 1.

For my class I need to make a "Guessing Game" Program. Basically you just pick a number between 1-1000. It tells you if you are too high, too low, or correct. If your too high or low you guess again until you get it right. When you get it right it is supposed to tell you how many tries it took...

Hi guys, I am noobie in number theory so if something exists better than this equation I did please don't bash me this is my first equation. Today I was thinking of a way to count all even from 1 to n,so this way I thought about is like this. Let me first write the equation,then I will...

I can perform counting 0-99 but how do you stop it in 59 then 00 then back to 01? heres a sample

Sorry to butt in on your form. Please can someone help me with this – I’m sure it’s simple to those who know but I have been thinking about these 2 problems for ages (and reading up on every website I can find) and still no answer. I am trying to get a basic understanding of this and seem to...

I am currently trying to program an FPGA to mimic a coincidence counting module. What I basically need it to do is a modified AND operation. The inputs are square, 5V pulses from photon counters. Because I am working with two photon counters (that are the same model) but due to imperfections in...

My question is, when extracting the count rate from a particular peak in the energy dispersive spectrum (e.g. X-ray fluorescence) Is this done by simply drawing a straight horizontal line from the top of the peak to the y-axis and the corresponding intercept will be the count rate? What if the...

Say, what if you were coauthor on a publication with > 100 citations? And if so, how would I mention it on the CV?

I need to keep track of the size of the matrix myself. This means I can't use "size" function. Is it possible? For example, A is a 5 x 5 matrix. I need to create a vector x=[0,0,0,0,0]. It should be just x = zeros(size(A,1),1); %or length(A) but I need to check the size of A matrix...

Can anyone explain to me how to count the total # of non-invertible 2x2 matrices? I have the answer from the book, which is r^3+r^2-r provided r is a prime. But it doesn't explain how to get there, and I couldn't figure it out. I haven't been practicing linear algebra for quite a long...

I was reading some text about the vernier calliper and it was written that it's least count is equal to 1 Main Scale Division unit - 1 Vernier Scale Division Unit = Vernier Constant. Can someone explain how is the least count, that is the least distance that can be measured on the calliper...

greetings, what is the meaning of controlled loop and count controlled loop? advanced thanks.

Hey guys, What method[s] do astronomers use to count the stars in the galaxy to come up with a number ?

Does the new estimate on the number of red dwarf stars in the universe suggest a different proportion of He/H? (current helium abundance estimate is 24%) Would it be lower since more mass would be tied up in low-mass stars (like red dwarfs) in which He/H<0.24.? If not, how many more times should...

What courses count as "upper-division physics?" (also, which GPAs to list) Okay, here is my department's course catalog: http://www.washington.edu/students/crscat/phys.html Anyways, does a "Elementary Mathematical Physics" course count as upper-division physics course? What about a "modern...

Homework Statement [PLAIN]http://img822.imageshack.us/img822/2753/72281206.jpg Yeah...

Hi, I have two majors ,one in Physics and the other is Electronics engineering.I have 7 years of work experience in Embedded systems and firmware development. I want to do MS from a reputed US university( like Stanford ,University of California Berkeley etc). Do you think I stand a good...