What is Zero: Definition and 1000 Discussions

Gonzalo Raúl Barrios Castro (born April 17, 1995), known by his gamertag ZeRo, is a Chilean former professional Super Smash Bros. player and streamer. He was considered the best Super Smash Bros. for Wii U player in the world throughout his career, with a record-breaking 56 consecutive tournament wins in the game from November 2014 to October 2015, including high-profile tournaments such as EVO 2015 and The Big House 5. Prior to the release of Super Smash Bros. for Wii U, he was a top ranked Super Smash Bros. Brawl and Project M player. His best known characters are Diddy Kong in Super Smash Bros. for Wii U, Pit in Project M, Meta Knight in Brawl, and Fox in Melee. He is the only player to have earned more than US$100,000 playing Super Smash Bros. for Wii U competitively.
Barrios retired from professional competition in July 2020 following allegations of sexting two minors in 2014, which also led to Barrios' sponsors cutting ties with him. Barrios later publicly admitted to the allegations.

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  1. P

    Taking the zero entry of the following

    Hello! Given: g_{ρσ} = g_{μ\nu}\Lambda^{μ}_{ρ}\Lambda^{\nu}_{σ} equation (1) It was then mentioned to take the 00 entry of equation (1): So, it went like 1= \Lambda^{ρ}_{0}g_{ρσ}\Lambda^{σ}_{0} equation (2) then equation (2) was set equal to (\Lambda^{0}_{0})^{2} -...
  2. M

    Find the zero divisors and the units of ##\mathbb Z[X]/<X^3>##

    Homework Statement Find the zero divisors and the units of the quotient ring ##\mathbb Z[X]/<X^3>## The attempt at a solution If ##a \in \mathbb Z[X]/<X^3>## is a zero divisor, then there is ##b \neq 0_I## such that ##ab=0_I##. I think that the elements ##a=X+<X^3>## and...
  3. R

    Why the net field inside a conductor is zero?

    I do not really understand the big picture of gauss law. For what I know a conductor is a material where electrons can move freely, but I am reading my book and they show pictures where the protons are all right below the surface. My other question would be how can you describe the inside of a...
  4. B

    Are These Properties of Zero Correct?

    x + 0 = x x - 0 = x x(0) = 0 x(0) = undefined ...is this how you call it or is it no solution? x^0 = ? What is x raised to the zero power? square root of 0 = ? Not sure about this one either. If anyone knows of any other properties of zero I'm leaving out, please feel free to...
  5. KleZMeR

    Angular Momentum Term Equals Zero?

    Hi All, This is from a classical mechanics problem, and I already 'solved' the problem, but I'm interested in why a certain term is set to zero. I think I understand the concept but just want to clarify. The problem is a table with a hole in it and two masses on a string, one mass is...
  6. B

    Is Zero the Ideal Outcome? Exploring its Value on a Number Line

    Just something I've been chewing on. Let's create a number line: [-3,-2,-1,0,1,2,3] In the number line, the values approach zero in the negative spectrum and then ascend from the positive spectrum. Yet, zero is consider the medium. Some argue that zero's purpose as a placeholder gives it no...
  7. C

    Hessian matrix of the Newtonian potential is zero?

    So I'm looking at the hessian of the Newtonian potential: \partial^2\phi / \partial x_i \partial x_j Using the fact that (assuming the mass is constant): F = m \cdot d^2 x / d t^2 = - \nabla \phi This implies: \partial^2\phi / \partial x_i \partial x_j = -m \cdot...
  8. DiracPool

    Zero-Energy Universe Hypothesis: Questions & Answers

    I ran a search and didn't see anything posted recently, at least, on the current thoughts behind the zero-energy universe idea. http://en.wikipedia.org/wiki/Zero-energy_universe I had a few questions about this: 1) What is the opinion of people on this site of the validity of this idea...
  9. B

    Zero electric potential related to electric field.

    Homework Statement Which one of the following statements concerning electrostatic situations is false? a) No work is required to move a charge along an equipotential surface. b) If the electric potential with a region of space is zero volts, the electric field within that region must also be...
  10. bcrowell

    Exponentiation with zero base, complex exponent?

    Is there a good general definition of 0^z, where z may be complex? The cases where z is real (and positive, negative, or zero) are straightforward, but what if z isn't real? Are there arbitrary branch cuts involved, or is there some universal definition?
  11. T

    Is the Zero Vector in the Linear Subspace H?

    Lets say H = [3a+b, 4, a-5b] where a and b are any scalars. This not a vector space because Zero vector is not in H. I don't get what it means by zero vector is not in H? Can't you just multiply the vectors by zero and get a zero vector? I am confused.
  12. johann1301

    Is Zero Considered a Real Number?

    Is zero a real number?
  13. D

    Zero Impedance in Oscillating current transformer

    Hi, I have read Steinmetz books and he has a very good example of OC phenomenon that is nothing like AC case. There are certain conditions under which an OC transformer has zero impedance. Also, on his chapter of long transmission lines, he says quarter wave resonance using abrupt pulses can...
  14. N

    Is it possible for something to have true zero movement?

    Can something even exist without energy? And if it can will it truly not move?To be clear I know E=mc2 but can something exist without any movement?
  15. B

    Zero Divided By Some Integer n

    I tried to prove this claim, as I require it to finish one of my proofs. By definition, if a,b are integers, with a \ne 0, we say that a divides b if there exists an integer c such that b = ca. So, n divides 0 means that there exists some integer c such that n = c*0 = 0. But this would...
  16. TheSodesa

    Finding a limit of an expression when the denominator tends to zero.

    Homework Statement This problem is found in a chapter about rational functions in my review book. The expression is as follows: \lim_{x\rightarrow a} {\frac{2 x^2 + 5x - 3}{x - a}} = \ \text{L} where 'a' is a constant. I'm supposed to find a value of 'a' that allows the limit to...
  17. Abhijeet

    Construct a System with Zero Power Consumption: An Electromagnetic Idea

    I am talking about electromagnetism.. Can we construct a system with no power consumption.. I ve an idea... 1 we can construct rail route surrounded by dome shaped copper (actually cu strips to avoid eddy current) 2 rail on which permanent magnet is fixed will allowed to move on this...
  18. kelvin490

    Can Gas Maintain Its State at Near Zero Kelvin Temperatures?

    Consider an adiabatic expansion of an ideal gas that work is done against friction or a piston. Since no heat exchange can occur the gas keep on losing energy and its temperature decreases and the gas molecules getting further and further apart. In principle the temperature can get down to a few...
  19. Adjoint

    What is the meaning of a null vector in physics?

    We know that a null vector (or zero vector) has direction but no magnitude. I am having some trouble understanding this concept. 1. What's the direction of a null vector, really? 2. Also as null vector is a vector, can velocity or acceleration also be null vectors? 3. If so, then what...
  20. T

    Meaning of zero gradient vector with existant directional vector

    I'm supposed to find the gradient vector of the function below at (0,0), and then use the dot product with the unit vector to find the directional derivative. Then find the directional derivative using the limit definition of a directional derivative, and explain why I get two different...
  21. baby_1

    Where does electric field go to zero?

    Hello Here is an example.we want to calculate value of x where Electric filed going to be zero.i want to use vector form of coulomb equation So as we know for 1c: for -9C: so as we do superposition we obtain So In this problem x doesn't have any real number.what is my problem? Any help...
  22. S

    Zero field cooled / field cooled susceptibilities

    I'm studying magnetic properties of nanoparticles in a liquid carrier and trying to understand better zero-field-cooled/field-cooled curves. We use the Stoner–Wohlfarth model and Chantrell calculations to model ZFC/FC curves but I'm having some issues to follow the calculation. Does anyone...
  23. ugenetic

    Maxwell's 4th equation. BUT, curl of H is zero everywhere

    please go to "Wolfram Alpha" website, (google the term) and copy paste the following formula: curl ( (-y/(x^2+y^2), x/(x^2+y^2), 0) you can see the result is zero I think that's the expression of H surrounding a current. what am I missing?
  24. R

    Fourier transform question, keep getting zero, minus infinity limit

    calculate the Fourier transform of the function g(x) if g(x) = 0 for x<0 and g(x) = ##e^{-x}## otherwise. putting g(x) into the transform we have: ##\tilde{g}(p) \propto \int_{0}^{inf} e^{-ipx} e^{-x} dx## which we can write: ##\tilde{g}(p) \propto \int_{0}^{inf} e^{-x(ip+1)} dx##...
  25. M

    What is the Difference Between 'Identically Zero' and 'Zero' in Mathematics?

    hey pf! when would you use "identically zero" as opposed to simple "zero". example: f is identically zero on interval a to b. or, f is zero on interval a to b. why do we ever use identically? it seems superfluous... thanks!
  26. U

    Zeeman Effect - average shift is zero?

    Homework Statement Part (a):Find the first order shift in energy Part(b): What is the degeneracy after perturbation? Find Show average shift in energy is zero. Homework Equations The Attempt at a Solution I've shown part (a), the troubling part is part (b). Part (b) With the perturbation...
  27. N

    Why is entropy zero in an adiabatic process?

    No heat exchange is facilitated during an adiabatic process. Change is heat is zero. How does this relates to the entropy being zero? ∫dQ/T? But this could really just mean that the integral is of any constant.
  28. Hardik Batra

    Find the points where electric potential is zero?

    There are two charges 2 C and 3 C and 100 cm apart from each other. Find a point where electric potential is zero? Consider 2 C charge on the origin.I have tried out but don't get it solution... 1) If you take point between two charges then 2 C----------100 cm------------------3 C...
  29. E

    Why shear stress components of the Stress Energy tensor not zero?

    Hi, I am having trouble understanding why Tij can be non-zero for i≠j. Tij is the flux of the i-th component of momentum across a surface of constant xj. Isn't the i-th component of momentum tangent to the surface of constant xj and therefore its flux across that surface zero? What am I...
  30. C

    Find the Distance for Net Zero Force: Two Charges at Origin and x=L

    1.)Two charges are fixed in location: charge q1= +8e is located at the origin and charge q2= -2e is located on the x-axis at x=L. At what point can a proton be placed so that it has net zero force acting on it? 2.)F=kq1q2/r^2 3.)I tried to do F=0 K = 8.988 X 10^9 (constant) q1 = (8...
  31. N

    Simple equation to show work done on an equipotential surface is zero

    w = ΔKE + ΔPE For a particle moving at constant speed, there is no change in velocity so no change in KE. What about change in PE for a partcile moving at constant speed on a equipotential surface? Would I be right in stating that since the particle moves along the same surface (AKA same...
  32. A

    Meaning of multi zero solutions

    Homework Statement I have solved the equation $$x^3=7x^2$$ giving roots at $$x=7, x=0$$ The solutions in the book also give a specific third solution of $$x=0$$ again. I can't see the point of this unless it is to reassure the reader that there are no further solutions to look for given...
  33. J

    Susskind said that the square of a differential equal zero

    Hello, I watched a lecture by Leonard Susskind, in which he said that a differential is so short that when you square it, you get zero. What exactly could he mean by this? Thank you for your time. Kind regards, Marius
  34. A

    Does Mapping with Bounded Distortion Preserve Zero Volume in Higher Dimensions?

    Homework Statement Let ##A\subset E^n## and let ##f:A\to E^m.## Consider the condition that there exist some ##M\in\mathbb{R}## such that ##d(f(x),f(y))\le Md(x,y)## for all ##x,y\in A.## Show that if the condition is satisfied, if ##m=n##, and ##\text{vol}(A)=0##, then...
  35. S

    Differential equations, zero state response

    Homework Statement Find the zero input and zero state response for the following system y''(t) + 3y'(t) + 2y(t) = 2 x'(t) - x(t-1) where x(t) = (2e^-t)*u(t) U(t) is the step function Homework Equations Y = Yh + Yp Y = Yzsr + Yzir The Attempt at a Solution I can't find...
  36. C

    Acceleration & velocity using instantaneous centre of zero velocity

    1. A link is connected by two bearings A and B. The bearings run along slots which are at right angles to each other. The length of the link AB (length between the centres of bearings A and B) is 0.2m. At an instant of time, height H, is 0.05m, and the bearing A has a constant velocity V, of...
  37. B

    Curvature of a circle approaches zero as radius goes to infinity

    Hello, this isn't a homework problem, so I'm hoping it's okay to post here. I would like to know the correct way to mathematically express the idea in my title. It is intuitively obvious that as the radius of a circle increases, it's curvature decreases. I looked it up and found that...
  38. A

    Is it possible? A voltage source with zero output short ckt current?

    That 2 terminals shows PD of 1 volt on Meter, but when shorted, there is no current shown on Meter? I checked and rechecked [using different meters, wires, AC, DC options and what not], so I see only V measurement, but no I. Is it possible? If so, then what is the use of that PD, when we can't...
  39. L

    Zero Potential and Electric Intensity in a 2D Plane with 3 Point Charges

    Homework Statement Let us have a square ABCD (D is in the topleft corner) of size 1 m. Let us have 3 point charges situated in points B, C and D. The charges are following QB=2C, QC=-1C and QD=5C. The task is to find (a) the points/plane where the electric potential is zero and (b) two points...
  40. Demon117

    Show that differentiable curves have measure zero in R^2

    Homework Statement (a) Let \alpha:I=[a,b]→R^2 be a differentiable curve. Assume the parametrization is arc length. Show that for s_{1},s_{2}\in I, |\alpha(s_{1})-\alpha(s_{2})|≤|s_{1}-s_{2}| holds. (b) Use the previous part to show that given \epsilon >0 there are finitely many two...
  41. P

    Is it Necessary to Keep Zero Columns in an Augmented Matrix?

    If you have an augmented matrix and one column in your matrix is all zero (but not the answer column) are you able to 'delete' the all zero column and the corresponding variable? Because when you write out the equations, the co-efficient's of the variable corresponding to the all zero column are...
  42. evinda

    MHB Find all the zero divisors in a ring

    Hello! :D I am given the following exercise:Find all the zero divisors in the ring $\mathbb{Z}_{20}$. For each zero divisor $[a]$,find an element $[b] \neq [0]$ such that $[a][b]=[0]$. That's what I did..Could you tell me if it is right?? Zero divisors at the ring $\mathbb{Z}_{20}$: $\{ [2]...
  43. P

    Zero dipole moment in stationary state?

    P.W. Anderson in his essay "more is different" said that: "no stationary state of a system has an electric dipole moment". He used an example of NH3 to illustrate that. I then checked online and found that, Chemists said there is dipole moment in NH3 molecule, but (nuclear) physicists claim...
  44. M

    MHB Why is (x,e_i) a zero sequence?

    Hey! :o An infinite orthonormal system $\{e_1, e_2, ... \} \subset H$ is closed in $H$ iff $\forall x \in H$ $$||x||^2=\sum_{i=1}^{n}{|(x,e_i)|^2}$$ From the summability of the right part of the relation above, we conclude to that the sequence $(x,e_i)$ is a zero sequence. Could you explain...
  45. E

    Why does conditional probability used in mean square error equal zero?

    Hi guys, I am having trouble showing that \mathbb{E}\left[(Y-\mathbb{E}[Y|X])^{2}\right]=0. I understand the proof of why E[Y|X] minimizes the mean square error, but I cannot understand why it is then equal to zero. I tried multiplying out the square to get...
  46. L

    Friction when wheel slip is zero

    Most graphs show that when wheel slip is zero then the friction is zero. But I can't get it, as when the vehicle stand still on slope, the friction keeps the vehicle from going down hill Could someone explain for me? http://www.albi-engineering.nl/Electronics/Traction_Control/slipgraph.jpg
  47. D

    MHB What does zero at infinity mean?

    For the following algebraic expressions for the Laplace transform of a signal, determine the number of zeros located in the finite \(s-\)plane and the number of zeros located at infinity. Does that mean pole since at a pole the plot will diverge to \(\infty\)? Otherwise, what would be a zero...
  48. Z

    Elasticity: Determine zero normal stress plane

    Given the stress tensor in a point, determine the zero normal stress plane. ...2 3 0 T= 3 2 0 ...0 0 5 ---------------------- Eigenvalues: σ1=σ2=5, σ3=-1 It must be simple, but I don't know how to determine the normal vector of that plane analytically. I know σ=0. t=Tn=σ+τ=τ If normal stress...
  49. C

    Where is the electric field zero?

    Homework Statement Two point charges are placed 1.00m apart. q(1) = -2.50 x 10^(-6) C q(2) = +6.00 x 10^(-6) C Task is to find where along the line, other than at infinity, the electric field will be equal to zero. Homework Equations E = (k * q) / r^2 The Attempt at a Solution...
  50. O

    Voltage at a spot where the force on a charge is zero

    Suppose you have a system of charges on the xy plane. Am i correct in saying that the place where you have zero volts, is the place where you can put a charge and it WONT move?
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