What is even: Definition and 664 Discussions

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. S

    I cant even find words on how to ask this question. My father brought

    I can't even find words on how to ask this question. My father brought it up to me and I don't know how to answer it... I am at a fixed location you take off at near light speed away from me, 5 years later I look up in the sky and you would almost be 5 light year away from me. Now because...
  2. N

    Sum over k from 0 to an even n of abs(k/n - 1/2)*C(n,k)=(1/2)*C(n,n/2)

    Odd number of terms so there is a middle term. It is equal to 0. Since C(n,k)=C(n,n-k), abs(k/n - 1/2)=abs([n-k]/n - 1/2), and what's in the abs() increases and is positive k goes from 0 to n/2 -1, the sum is twice the sum of the first n/2 - 1 terms, 2*(1/2 - k/n)*C(n,k). Added C(n,k) from 0...
  3. W

    1D Groundstate wavefunction always even for even potential?

    Hi! I have calculated various eigenstate wavefunctions for a one-dimensional system of a particle in a potential. The potential is an even function. All the wavefunctions have become either even or odd functions which I understand why. The ground-state wavefunction has always been even, is...
  4. C

    Prove sum of two primes is even

    Homework Statement Prove: If a and b are prime numbers larger than 2, then a + b is even. The Attempt at a Solution Can i just say that prime numbers larger than 2 are odd and then prove that the sum of 2 odd numbers is even. And can i say that prime numbers larger than 2 are odd because...
  5. S

    Why would FTL not be possible even in a noiseless place?

    I am illustrating this via both questions and an experiment both of which are conceptually are dealing with the same idea. http://en.wikipedia.org/wiki/Coincidence_counting_(physics ) Question: 1 a) if there were zero noise, and only single photon was sent, do we need a co-incidence...
  6. T

    Diffraction on a body centered lattice, h+k+l even?

    This is in my book: exp[2\pi i(hx+ky+lz)][1+exp(\pi i(h+k+l))]=2exp[2\pi i(hx+ky+lz)]\cos^2[\frac{\pi}{2}(h+k+l)] And in order for the cosine not to be zero, h+k+l must be even when we want to see the reflection. But I think that the result should be exp[2\pi...
  7. A

    Mass creation from m=e/c^2. is it even possible?

    take a cunductive wire. coil it (for conventional space) then run electrons through it with 8.98755179 × 10^16 J (the same number for the speed of light squared) of energy. ( i realize that doing that is nearly or completely impossible). using the equation m=e/c^2 e and c^2 are the same...
  8. T

    For the webpage title: Proving the Oddness of 5x-3 for Even x Using Direct Proof

    Homework Statement Prove by direct proof that 5x-3, where x is an integer, is odd for all even x. Homework Equations N/A The Attempt at a Solution Let x=2a, where a is an integer. It follows that 5x-3=10a-2-1=2(5a-1)-1. Although it is obvious, I don't know how to logically prove...
  9. C

    Should I even continue Engineering

    Hello all, I am about to go into my 2nd year at my university and all I can say is that my first year was incredibly stressfully and filled with depressing downturns. Here it goes: 1.) I did not pass any placement exams for the maths (was not paying attention in High School) and was unable to...
  10. F

    I am an idiot. I can't even do this properly

    Homework Statement If the point (6, -12) is on the graph of y = f(x), which point must be on the graph of y = f(-x/3 + 6)? M/C a) (-36,-12) b) (-24, -12) c) (0, -12) d) (16,-12) The Attempt at a Solution First of all, I am a little confused why doesn't the y value change? Why is it staying...
  11. W

    Even Hitler rants about Jackson EM book

    Guys, I found this Downfall parody video about how much Hitler hates Jackson EM book: Apparently, even he can't stand Jackson after one full semester of EM course. :D
  12. P

    Show that if x(t) is even, then so is X(s).

    Homework Statement If a signal x(t) is an even function, how do I show that its Laplace transform X(s) must be even as well? Homework Equations X(s) = Integral(-inf,inf) of x(t)*e^-st dt The Attempt at a Solution I can show this for specific functions x(t), but how would I show this in...
  13. O

    EVEN and ODD function in quantum

    hi, I want to ask you something about the equation in the quantum which is called like EVEN and ODD function and we are solving according to this values and when the functions have been even and odd, we re saying that is equal to zero like that.. I am wondering actually, We are saying...
  14. F

    Just a theory question on odd and even functions

    Homework Statement If a function is even or odd, what can one conclude about its inverse? The Attempt at a Solution Let f(x) = f(-x) f-1(x) = f-1(-x) Let g(x) = -g(x) g-1(x) = -g-1(x)
  15. U

    For the series sum(n=1)(inf) (-1)^n*a_n where a_n = 1/n when n is even

    For the series sum(n=1)(inf) (-1)^n*a_n where a_n = 1/n when n is even and 1/n^2 when n is odd, is it divergent?
  16. B

    News Free trade reduced to one sentence so even a liberal can understand

    The more people with whom you trade the richer you get, regardless of whether they are across the street or across the world; the fewer with whom you trade the poorer you get. If you could not trade with anyone you would have to make everything yourself and you'd be very poor or dead.
  17. Femme_physics

    What is the critical point and location of this graph?

    Homework Statement http://img508.imageshack.us/img508/5761/calculus01question.jpg Do they mean 1/x? I'm not sure what they mean by 1 over f(x) It seems to me I just have to answers questions based on the graph. From some reasons my answers are off compared to the answer book...
  18. nukeman

    These Homemade Solar Panels .Do they even work?

    These "Homemade" Solar Panels...Do they even work? http://solarpanelhandyman.com/uncategorized/how-to-make-a-diy-solar-panel-simple-steps/" I am trying to figure out a project to make for a class of mine, where we have to build a "Green" type system, bla bla... Has anyone ever tried? Do...
  19. S

    Related to fourier transfrom figuring out when a function is odd or even

    I left a post up re. Fourier transforms and this query is on the same question: having solved the heat equation in infinite domain in terms of U(alpha,t) we now want to inverse transform back to u(x,t): U(\alpha,t)=\frac{2u_{0}}{\sqrt{2\pi}}\frac{sin\alpha}{\alpha}e^{-k^{2}\alpha^{2}t}...
  20. S

    Fourier series odd and even functions

    Hello I'am a little confused. In my textbook it is written that all odd function can be described by a sine series. I have this following equation from an exercise: A_{0}+\sum\limits_{n=1}^\infty (A_{n} cos(n \phi) + B_{n} sin(n \phi))c^{n} = sin(\dfrac{\phi}{2}) It's a standard...
  21. R

    Even Real Particles don't exist Aage Bohr

    Maybe not only virtual particles don't truly exist (as believed by many physicists now). Real particles don't exist as well. According to Aage Bohr, the son of Neils Bohr, particles don't really exist. Nothing moved through the space between the emitter and detector in the double slit...
  22. H

    Fourier Series: Is f(x) Even or Piecewise Continuous?

    Hello. I have to find the Fourier series for f(x) = 1 + cos(pi x / L). My question is about f(x) Is this function even? I plotted it out and it looks even. The question I am completing starts off by saying: assume that any function f for which f and its derivative are piecewise continuous...
  23. M

    What does an engineer even do?

    What does an engineer even do? So I have a problem that I know has to walk through this forum consistently. Basically, I really enjoy my math and physics classes (current experience: calc1-calc3, classical physics 1 and 2). I also really like designing and building things (go FIRST Robotics!)...
  24. C

    Why are Cosine and Secant Even Functions?

    Homework Statement Why is Cosin and Secant even? Cos (-t) = cos t, Sec (-t) = sec t Why don't they equal - sec t instead like the rest of the functions? Thanks Homework Equations The Attempt at a Solution
  25. K

    Math Can you even start a business with a math degree?

    So most of my friends who are in more "applicable" programs in university have a desire to start a business. They're in engineering mostly but what kind of business can you even start with a math degree? I don't really want to be working for somebody my whole life but if you're in...
  26. mnb96

    How to find a basis for the space of even functions (with some constraints)

    Hello, I am considering the set of all (differentiable) even functions with the following properties: 1) f(x)=f(-x) 2) f(0)=a_0, with a_0\in \mathbb{R} 3) f(n)=0, where n\in \mathbb{Z}-\{0\} One example of such a function is the sinc function sin(\pi x) / \pi x. Is it possible to find...
  27. Demon117

    What on earth does this statement even mean?

    Homework Statement Suppose that f : R2 |--> R and that each “slice” x l--> f(x, y), y in R, is continuous. If df/dy (partial) exists (everywhere) and is continuous, show that f is continuous. I don't quite understand the notation here, a little help on this will be useful. I could...
  28. F

    I think I am brain dead today. I can't even solve this simple problem

    Homework Statement A uniform electric field of magnitude 325 V/m is directed in the negative y direction in Figure P25.9. The coordinates of point A are (-0.200, -0.300) m, and those of point B are (0.400, 0.500) m. Calculate the potential difference VB - VA, using the blue path...
  29. F

    Does this even make sense? Measuring voltage of a capacitor

    Homework Statement This is a lab problem and basically I am supposed to explore the properties of a capacitor. Here is the question that confused me
  30. W

    Odd vs. Even number of Nucleons.

    Yeah I'm taking this introductory nuclear science class, we're reading Rhodes's Making of the Atomic Bomb. Apparently, U235 with a neutron added now has an even number of nucleons while U238 obviously has an odd number with the single neutron bombarment. And this affects fission likelihood. So...
  31. K

    Programs How is it possible to even double major in engineering and mathematics?

    When i hear people say this, i don't even believe them. I'm looking at the course calendar for electrical engineering at the university i want to attend and the course calendar for a math major at the same university. It's just not possible. Like quite literally there's just not enough credits...
  32. F

    Antiderivative of an even function

    Is the antiderivative of an even function even? Specifically, given an even function g(x)=g(-x) will the following function be even? Odd? For constant a>0, r a dummy variable h(x,t) = Definite Integral [ g(r) dr, FROM x-at TO x+at] Asking whether or not h(x,t)=h(-x,t) This is the...
  33. J

    What do the markings on a capacitor mean?

    I have a capacitor that is marked different than most I've run into in the past. I'm not sure how to read it. It looks exactly like this: K*E 102 100 NCC Where the "*" is there is an undistiguishable mark. possibly a "N" inside a circle. It's printed exactly like that on a reddish brown...
  34. G

    Proof with even numbers and divison

    Homework Statement Prove that the product of two even integers is divisible by four. Homework Equations The Attempt at a Solution If a·b where (a^b)ЄZ+, then 4|(a·b) If 2|a ^ 2|b, then (a^b)≥2 v (a·b)=0 If 2|(2·n) then 4|[2·(2·n)] for nЄZ ∴ 4|(a·b) where (a^b)ЄZ+ [X]Is my proof correct? Is...
  35. S

    Is the Dirac Delta Function Even?

    Hi this is my first post here so I'm sorry if my question seems trivial. I haven't worked a lot with the dirac delta function before, so i always thought that the shifting property would only work as: \int\delta(x-h)\;f(x)\;dx=f(h) Now I've been reading some articles and I came across...
  36. X

    Proving Even Number Additive Inverse is Even

    Homework Statement How do I show that the additive inverse, or negative, of an even number is an even number ( direct proof) ? Homework Equations The Attempt at a Solution I have no idea. Anybody?
  37. G

    Even light would take an infinite time

    Thus wrote PAM Dirac in his little monograph, "General Theory of Relativity", p.34t. More fully, "Even a light signal would take an infinite time to cross the boundary r = 2m, as we can easily check." Yes, we can, and I did easily by setting ds = 0 in the Schwarzschild solution for a...
  38. C

    Dumbest idea I've even heard in my life

    Check this out: http://edition.cnn.com/2011/TECH/innovation/01/19/smart.roads/?hpt=Sbin Tell me if this is anything more than retarded. I don't mean to sound insulting, but this cracked me up, that's how sad it is. There are so many problems with this, I don't even know where to begin. I'm...
  39. N

    Proving that (Even Numbers)^n = Even Numbers

    Homework Statement Let "a" be an element of any integer. Let "n" be an element of any natural number that is greater than or equal to 2. The integer "a^n" is an even number if and only if "a" is an even number. Prove this bi-conditional statement. Homework Equations Definition of an even...
  40. W

    Four-Momenta derivation: is this mathematical step even valid?

    Homework Statement Hey all, this is my first post to the forum, but I've been reading for years. Anyways, I was reviewing a solution to a Compton Scattering derivation we learned in class, and am still trying to make sense out of it. Homework Equations Given, we have the initial and...
  41. Femme_physics

    Is this static equilibrium problem even solvable?

    Okay, me and my friend have been working on this problem for a while and it just been a headache catalyst for us...your help is called upon, people of the internet. Homework Statement A system of weights is in equilibrium. Calculate the distance "s" where WD = 5[N] WF = 5 [N] WE =...
  42. A

    Do even torch lights twinkle in the sky?

    Dont ignore this as a hypothetical one, but really I have some doubt... suppose we made a very bright torch light and took it to Mars. Now assuming that the light is bright enough for me to observe it from Earth with the naked eye, would we see the light twinkling? Is the twinkling only...
  43. N

    Proving: If a is Even, Then 4 Divides a

    Homework Statement Let a and b be a natural numbers such that a2 = b3. Prove the following proposition: If a is even, then 4 divides a. Homework Equations Definition: A nonzero integer m divides an integer n provided that there is an integer q such that n = m * q. Definition: A even...
  44. Simfish

    Can paper be carbon-neutral or even better?

    They can only be carbon-neutral or better if sustainably harvested, of course. And only if the lumbar companies plant trees after they fall them. But if these assumptions hold (which I believe they do in many regions of the U.S.), then cutting down trees helps sequester carbon. Trees grow...
  45. D

    Group Theory: Prove o(b) even if ab = b^-1a

    Group Theory: Prove o(b)|2 if ab = b^-1a Homework Statement Suppose G is a group and a, b \in G a) If o(a) is odd and a*b = b^−1*a, prove that o(b)|2. b) If o(a) is even and a*b = b^−1*a, does it follow that o(b)|2? Prove your answer. Homework Equations n/a The Attempt at a...
  46. K

    Math Do I even have the capabilities to do a math degree?

    So I've had this goal of doing a math degree for almost 1.5 years now. I'm currently taking a class in adult high school called Calculus and vectors. It's basically the basics of calculus all the way up to differentiating geometric functions (sin,cos,tan). The vectors part is all the way up to...
  47. Simfish

    Why do people even teach quantum mechanics without braket notation?

    To me, braket notation just seems much easier and more intuitive than the approach from Griffiths. And yes, I learned QM through a text that used braket notation.
  48. T

    Should I even try physics at this point?

    Hello, I'm currently a sophomore in college and I'm majoring in econ. I find econ boring and I'm not motivated in my classes. To me, physics has always been a very interesting topic and I'm thinking about switching majors to it. Unfortunately, doing so would require me to take a total of 5 years...
  49. madmike159

    Are all functions odd or even?

    For functions when doing Fourier Transforms, when a function is odd bn = 0 and when a function is even an = 0. Are all functions odd or even, or are there some cases where they're both / neither?
  50. F

    Why is angular acceleration positive even though it is going clockwise?

    Homework Statement Go to http://apcentral.collegeboard.com/apc/public/repository/ap08_physics_c_mech_frq.pdf Question two The solution is http://www.collegeboard.com/prod_downloads/ap/students/physics/ap08_physics_c_mech_sgs_rev.pdfThe Attempt at a Solution My question is part d) in the...
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