even Definition and 664 Threads

The break-even point (BEP) in economics, business—and specifically cost accounting—is the point at which total cost and total revenue are equal, i.e. "even". There is no net loss or gain, and one has "broken even", though opportunity costs have been paid and capital has received the risk-adjusted, expected return. In short, all costs that must be paid are paid, and there is neither profit nor loss. The break-even analysis was developed by Karl Bücher and Johann Friedrich Schär.

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  1. T

    Why was mercury considered a metal even in ancient times?

    Today we know that mercury is a metal even though it's a liquid, because we already know its position in periodic table, its ability to conduct electricity, but these features of mercury were not known in ancient times ( for example, in the age of great greek philosophers). Yet it was considered...
  2. A

    Why is this trigonometry function neither odd nor even?

    f(x)=1+sinx what am I doing wrong here? 1+sin(-x)= 1-sin(x)
  3. E

    Odd & Even Functions (was thread Fourier Series )

    Odd & Even Functions (was thread "Fourier Series") Homework Statement determine if the functions below are odd even or neither: a) f(x)=x^2+2 b) f(x)=(x^2+2)tan(x^2) c) f(x) = (x^2+2)sin(x)tan(x^2)Homework Equations even - f(x) = f(-x) odd - f(-x)=-f(x) The Attempt at a Solution I've managed...
  4. L

    Can we prove every number is even or odd without induction?

    It is a simple exercise to prove using mathematical induction that if a natural number n > 1 is not divisible by 2, then n can be written as m + m + 1 for some natural number m. (Depending on your definition of odd number, this can either be stated as "every number is even or odd", or as "every...
  5. R

    Why will a composition function of an even function always be even?

    I apologize in advance if the answer to this is really simple; I often overlook simple solutions when something trips me up. For example, if f(x)=x2 and g(x)=x3/2, and g(f(x)) is therefore, after simplification, x3, why is that still an even function if x3 graphed under other circumstances is...
  6. P

    2nd order ODE's odd and even functions

    Hi I have been looking at some lecture notes inc the following example. Solve : y'' + ω^2y = (some even function) The particular integral is then found using Fourier series. As the function on the RHS is even this only includes cosine terms. The complementary function is found from...
  7. C

    If time didn't exist could anything move or even happen?

    I have a question that might have a complex answer. If time didn't exist could anything move or even happen?
  8. J

    Even number problem in book volume

    Homework Statement Hey, I got an even number from my book trying to double check it so if you wouldn't mind I would appreciate some comfirmaion or denial. Find the volume of the solid obtained by rotated te region bounded by the given curves about the specificed line. y = x, y =0, x =2...
  9. Seydlitz

    Does this small odd and even proof works?

    This is taken from Peter J. Eccles, Introduction to Mathematical Reasoning, page 17. This is not a homework because it is an example in the text. Prove that 101 is an odd number. The text has given a way of proving it and I just want to do it with my own approach. Prove that 101 is an odd...
  10. A

    Mathmatically, why are parallel universes even theorized?

    Hi all, What is the Hamiltonian or main equation, that if you solve it, parallel universes are predicted? For example, the Dirac equation, if solved, predicts the existence of anti-particles. If You solve Maxwell's Equations, you predict there should be E & M waves. Solving certain...
  11. V

    Recognizing even or odd permutation easily?

    Hello folks, I'm not even sure if this is the place to put this but with some luck it might be. I just have a general question about permutations. I understand the concept of even and odd permutations of a set of numbers, what I am hoping for is an easy way to figure out if (given a...
  12. fluidistic

    I don't understand the notation (tensor?, not even sure)

    Homework Statement In order to show that if ##(\vec E (\vec x, t), \vec H (\vec x, t))## is a solution to Maxwell's equation then ##(\vec E (\vec x -\vec L, t), \vec H (\vec x-\vec L, t))## is also a solution, my professor used a proof and a step I do not understand. Let ##\vec x' =\vec...
  13. Saitama

    Odd or Even Function: Logarithmic Equation Analysis for Homework

    Homework Statement Determine whether the following function is odd or even or none: $$f(x)=\log \left(x+\sqrt{1+x^2} \right)$$ Homework Equations The Attempt at a Solution For an even function, ##f(-x)=f(x)## and for an odd function ##f(-x)=-f(x)##. Replacing x with -x in the...
  14. I

    Schools Should I even bother applying for grad school?

    Hey, I know there's a sticky on top of the page kind of about this but I read through the thread and I have a pretty particular case that which isn't really addressed. I just finished my undergrad studies, received a B.A. a few months ago in May, and I was thinking about going to school...
  15. Y

    Understanding Odd and Even Functions in Trigonometry

    Just want to verify ##e^{jx\cos(\theta)}## is EVEN function respect to ##\theta## as ##e^{jx\cos(-\theta)}=e^{jx\cos(\theta)}## BUT ##e^{jx\sin\theta\;}## is neither ODD nor EVEN because ##\;e^{jx\sin(-\theta)}=e^{-jx\sin(\theta)}\neq\;^+_- e^{jx\sin\theta}## Thanks
  16. O

    Rearrange for x. Is this even possible?

    Hi all, Homework Statement I'm working on a problem related to an MRI signal equation. Essentially I want to derive an equation that can tell me the point at which f(x) is maximum. I have differentiated with respect to x and double checked that there are no errors. But now I am stumped at...
  17. D

    Issue with Fourier Series of an even function.

    Hi, I wish to obtain the Fourier series of the signal in red (please see attached figure fig1_sine_plots.png). Basically, it is a full-wave rectified 3f sinusoid, where f = 50Hz. The blue signal represents a sinusoid with frequency f = 50Hz. In the following equations (please see attached...
  18. B

    Starting Physics: Tips for High School Students

    I'm in high school, all honors/AP..etc, and I won't be able to take the physics course at my school for another year or two (I've tried to take it earlier, believe me). Anyway, I've always had a huge fascination with space and the world and how it works, with an larger interest in antimatter and...
  19. R

    Is the Function f(x) Odd or Even? Proving with Real Numbers

    Homework Statement 1) f(x+1)=f(x)+1 2) f(x^2) =(f(x))^2 let a function real to real satisfy the above statements then prove whether the fuction is odd or even. Homework Equations The Attempt at a Solution using the 2) we get 1) f(0) = 0,1 2) f(1) = 0,1...
  20. U

    What ion is this? even emission lines matches lyman series of hydrogen

    Homework Statement Calculate the wavelength of the Lyman-α line (the transition from the 1st excited state to the ground state) for (a) hydrogen atoms and (b) positronium e+e-, and explain the origin of their difference. In the light emitted from a star, a pattern of emission lines is found...
  21. WannabeNewton

    Physics BS - is it even worth it?

    Hi guys! I had a recent talk with my friend about my college debt / tuition and future job prospects as a means of paying off that debt and he voiced his concerns about my future financial state, concerns which hit me square in the face and brought me back down to reality - now I just can't stop...
  22. Y

    Is the Combination of Sin Functions an Even Function?

    Is f(x)=\sin[a(b+|x|)]\;\hbox{ and }\; g(x)=\sin[a(b-|x|)] Both EVEN function? It looks even function to me even though it's a sine function( odd function), but the |x| make it an even function where f(-x)=f(x).
  23. C

    Stationary states, if V(x) is an even function proof

    Homework Statement Prove the following theorum: If V(x) is an even function (that is, ##V(-x) = V(x)##) then ## \psi (x) ## can always be taken to be either even or odd. Hint: If ## \psi ## satisfies equation [1.0] for a given E, so too does ## \psi (-x) ## and hence also the odd and...
  24. A

    A High School Student Asks: Should I Even Bother Applying to UT Austin?

    Hello, this is my first post :). I am a high school sophmore and am incredibly interested in physics... My school gives an intro-physics course for those who want to pursue it. I got over a one hundered average in that class, I have a 3.83 (out of 4) gpa. I also got advanced on the "MCAS"...
  25. T

    Fourier Series: Can even functions be changed to odd?

    When creating a Fourier series for a function f(x), I consider whether the function is odd or even first. Yet, often these functions are in the positive region [0, L] . Since f(x) is only defined in this region, can I change the function to get a desired parity? By example, my concern...
  26. I

    Definite integration, even function. confused about proof

    Homework Statement Let f be integrable on the closed interval [-a,a] If f is an even function, then \int^a_{-a}f(x)\,dx = 2\int^a_0f(x)\,dx Prove this. Homework Equations The Attempt at a Solution The solution is given in the book. Because f is even, you know that f(x) =...
  27. X

    Integral of odd or even functions?

    Is the integral of an even function an odd function and vice versa? I know the derivative is.
  28. C

    Series of sorts- Return 1 or 2 based on even or odd n

    I would like to create a series where for each term if n is odd the term =1 and if n is even, the term = 2. I.e. a_{n} = 1 if \ n \ is \ odd \ and \ a_{n} = 2 \ if \ n \ is \ even
  29. H

    A Series of Even numbers squared

    Homework Statement Is there a general formula for the sum of such a series (or can it be self derived) ? 2^2 + 4^2 + 6^2 + 8^2 ... N^2 (all the way till some even number N) Homework Equations \sum r^2 (from r=1 to r=N) = 1/6 * n(n+1)(2n+1) The Attempt at a...
  30. DiracPool

    Are Cover Versions Better Than the Originals?

    I wanted to start this thread as kind of an offshoot of the "best songs ever" thread. The spirit of this thread is to post cover versions of popular (or even not so popular) songs that you think are better than the original (or that you just really like:-p) As a part-time songwriter, doing a...
  31. PeteyCoco

    How are even and odd functions defined in n-dimensions?

    How are even and odd functions defined in n-dimensions? In my homework, we had to integrate f(x,y,z)= (x^2)z + (y^2)z + z^3 over a sphere centered at the origin. My answer came out to be 0 and I made the guess that it might be because f(x,y,z) was an odd function. Now, I don't know if this is...
  32. S

    MHB How Do Word Counts and Punctuation Vary by Language and Sentence Length?

    1. In this sentence there are . . seventeen words, eighty-four . . letters, one hyphen, four . . commas, and one period. 2. This sentence consists of . . sixteen words, eighty-three . . letters, one hyphen, four . . commas, and one period. 3. This sentence is composed . . of seventeen words...
  33. R

    Break even on cell phone plans

    Homework Statement A customer is choosing between two cellular phone plans. One plan has a monthly fee of $50 for an allowance of 500 minutes per month. If the customer uses more than 500 minutes, the charge is $0.35 per additional minute used. The other plan has a monthly fee of...
  34. V

    If n is an integer, and 3n+2 is even, prove that n is also even

    I am coming across hiccups in my proof process. I am given this problem - Prove: if n is an integer and 3n + 2 is even that n is also even. I have to apply a contrapositive proof to this problem. The form is then \negq therefore \negp .The problem becomes - if n is odd, prove that 3n+2 is even...
  35. C

    SA + SB always give pH= 7 even if concentration of SA is a lot bigger than SB?

    SA + SB always give pH= 7 even if concentration of SA is a lot bigger than SB? let's say 10 M of HCl react with 0.1 M of NaOH, is the pH at equivalence point also 7?
  36. M

    Gauss' Law Help don't even know where to start

    An electric field is E = 250 N/C i for x > 0 and E = -250 N/C i for x < 0. A cylinder of length 20 cm and radius 3 cm has its center at the origin and its axis along the x-axis such that one end is at x = +10 cm and the other is at x = -10 cm. What is the outward flux through each end? a) +x...
  37. M

    Discrete Fourier Transform on even function

    The DCT of an even function is comprised of just cosine coefficients, correct? I'm playing around in MATLAB and I came up with a simple even function 1.0000 0.7500 0.5000 0.2500 0 0.2500 0.5000 0.7500 1.0000 0.7500 0.5000 0.2500 0 0 0 0...
  38. T

    I am not a teacher or even student of physics but I am translating a

    I am not a teacher or even student of physics but I am translating a physics paper into English and I need some help. I have a sentence that may translate as follows: "Newton introduced m-dependency upon taking into consideration, within the context of his second law, the experimental fact...
  39. A

    Sound waves in even dimensions

    I read on the 'Ask A Mathematician/Ask A Physicist' blog that sound waves behave differently in an even-number of dimensions than they do in odd-number dimensions - that they 'double-back'. Why is this - and what does 'double-back' mean...
  40. C

    Are capacitors a viable option for storing charge in electronic circuits?

    I just finished my last physics class (e&m) and I was pretty intrigued by capacitors and their ability to store charge. I decided to take an electronics class next quarter so I bought a few things including breadboard, capacitor, resistor, diodes, motors, and so on. Now...I have a 50V 1000uF...
  41. D

    MHB How do I separate a function into its even and odd parts?

    There was a question but I figured it out. $$ g(\theta) = \begin{cases} \theta, & 0\leq\theta\leq\pi\\ \theta+\pi, & -\pi\leq\theta < 0 \end{cases} $$ So $g_e=\frac{g(\theta)+g(-\theta)}{2}$ and $g_o=\frac{g(\theta)-g(-\theta)}{2}$ \begin{alignat}{3} g_e & = & \frac{\begin{cases} \theta, &...
  42. nukeman

    Need More of This Crazy Physics Idea? Let Me Explain!

    Let me explain. Suppose I wanted to make the argument that we need more nuclear weapons. Sounds absolutely crazy, but based on some theories (I don't agree with) the more strength you have to more peace you will have. Can someone give me an example of anything else related to...
  43. M

    How do balloon-launched satellites even reach outer space?

    I recently saw an Elon Musk talk on YouTube where he commented on how if Earth's gravity were just a little stronger, then it would have been impossible to generate enough thrust to get into space. He cited that as the reason why only a handful of national governments have successfully reached...
  44. A

    Odd and even solutions to the SE

    In my book I need to prove the general theorem that I can always pick the eigenstates in the time independent Schrödinger equation to be either even or odd ψ(x). This provides that the potential is an even function and is not hard to show if you use that if ψ(x) is a solution then too is ψ(-x)...
  45. R

    Proving Existence of g in a Finite Group of Even Order

    Homework Statement Let (G,*) be a finite group of even order. Prove that there exists some g in G such that g≠e and g*g=e. [where e is the identity for (G,*)] Homework Equations Group properties The Attempt at a Solution Let S = G - {e}. Then S is of odd order, and let T={g,g^-1...
  46. M

    Prove product of 3 consecutive naturals is even

    1. Prove product of 3 consecutive naturals is even data i just want to know if this proof is acceptable, or is there a simpler proof. The Attempt at a Solution Proof: suppose if the product 3 consecutive naturals is dividable by 2 then it is even. Base case: n = 1 n (n + 1)...
  47. S

    Why poles of machine are always even?

    why poles of machine are always even?
  48. A

    Prove that the product of 2 consecutive natural numbers is even

    Homework Statement Prove that the product of two consecutive natural numbers is even. 2. The attempt at a solution Hi, I'm just starting to work with proofs by induction, I'm just wondering if this is a valid technique, and/or if I am being too verbose in my proof, thanks! Let...
  49. P

    Is this an even or odd function

    1. (sin4x + cos4x) Homework Equations The Attempt at a Solution (sin4x + cos4x) = (sin4(-x) + cos4(-x)) = -sin4x + cos4x im thinking it is an even function
  50. L

    Can Light Exist in Complete Darkness?

    even in darkness there is light ! this could be a stupid question but i hope i can get an answer of some sort . can the quote even in darkess there is light be proven? can there be light paticules waves photon or anything else in darkness thank you in advance
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