Basis Definition and 1000 Threads

Hello readers, Given the potential V(x) = - 1/ sqrt(1+x^2) I have found numerically 12 negative energy solutions Now I want to try to solve for these using matrix mechanics I know the matrix form of the harmonic oscillator operators X_ho, P_ho. I believe I need to perform the...

So in our notes we are given a general quadratic equation in three dimensions of the form: Ax^2 + By^2 + Cz^2 + Dxy + Eyz + Fxz + Gx + Hy + Iz + J = 0 And then they say, by some rotation we can change this to the standard form: Ax^2 + By^2 + Cz^2 + J = 0 The lecturer said don't worry...

I am revising vector spaces and have got stuck on a problem that looks simple ... but ... no progress ... Can anyone help me get started on the following problem .. Determine the basis of the following subset of $$ \mathbb{R}^3 $$: ... the plane $$ 3x - 2y + 5z = 0 $$ From memory (I studied...

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...

Hi i was just wondering if there is any concept/theory/idea (or anything really) that relates to a growing basis (primarily in R) . What i mean by a growing basis is the following; say you start off with one element in your basis and you encounter a number/vector that cannot be built by the...

Hi, I am analyzing the paper for my thesis and have Equation IF=-1*(1+cos(δ))*cot(θ)*σ_2-sin(δ)*cot(θ)*σ_1 where σ_1={{0,1},{1,0}} and σ_2={{0,-i},{i,0}} are the Pauli matrices The component σ_1 is diagonal in the (1/√2, +/- 1/√2) linear polarization basis and the component σ_2 is...

In "A Student's Guide to Vectors and Tensors" by Daniel Fleisch, I read that the covariant metric tensor gij=ei°ei (I'm leaving out the → s above the e's) where ei and ei are coordinate basis vectors and ° denotes the inner product, and similarly for the contravariant metric tensor using dual...

Homework Statement Let V be the subspace of R3 defined by V={(x,y,z)l2x-3y+6z=0} Find a basis B for the subspace. Homework Equations The Attempt at a Solution First I broke apart the equation such that: [[x,y,z]] = [[3/2s-3t, s, t]] = s [[3/2, 1 ,0]] +t[[-3, 0, 1]]...

okay so I'm having some conceptual difficulty given some vector space V (assume finite dimension if needed) which has some orthonormal basis i'm given a vector x in V (assume magnitude 1 so it is normalized) now my question is: can x belong to some orthonormal basis of v...

Hi PF people! I am not sure my question can elegantly fit in the template, but I 'll try. Homework Statement I am self-studying the 8th chapter of "Mathematical Methods for Physics and Engineering", 3rd edition by Riley, Hobson, Bence. In the section about unitary matrices, it is stated that...

I have read the follow bock...

Homework Statement The Attempt at a Solution Can someone please check my work?

Mod note: fixed an exponent (% --> 5) on the transformation definition.[/color] Homework Statement A is a (4x5)-matrix over R, and L_A:R^5 --> R^4 is a linear transformation defined by L_a(x)=Ax. Find the basis for the range of L_A. Homework Equations The Attempt at a Solution ##A =...

Homework Statement Let ##n## be a positive integer and let ##V = P_n## be the space of polynomials over ##R##. Let D be the differentiation operator on ##V## . Find a basis for the null space of the transpose operator ##D^t: V^*\to V^*##. Homework Equations Let ##T:V\to W## be a linear...

Homework Statement Given the basis vector: e1 = 1 0 0 0 e2 = 0 1 0 0 e3 = 0 0 1 0 e4 = 0 0 0 1 Express the following vector in terms of the basis: y = 3 1 2 5 Homework Equations e1 = 1 0 0 0 e2 = 0 1 0 0 e3 = 0 0 1 0 e4 = 0 0 0 1 y = 3 1 2 5 The Attempt at a...

Homework Statement I want to extend the below U set of vectors to R4. u1 = (0, 0, 0, -4), u2 = (0, 0, -4, 3), u3 = (3, 2, 3, -2). The Attempt at a Solution For a set of vectors to form a basis for Rn, the vectors must be LI and spans Rn(has n vectors) u1, u2 and u3 are...

Does anyone know what [SIZE="4"]L is? I'm trying to see if I could find videos on it on YouTube. On the first question this is what I think- [a;b] is a vector by the way: 1) [2;1]c1+[7;4]c2=[1;0] [2;1]c1+[7;4]c2=[0;1] I could have also combined those two by having the linear combination equal...

Homework Statement Let A be the matrix A = 1 −3 −1 2 0 1 −4 1 1 −4 5 1 2 −5 −6 5 (a) Find basis of the column space. Find the coordinates of the dependent columns relative to this basis. (b) What is the rank of A? (c) Use the calculations in part (a) to...

We define basis as: Let M be a module over a ring R with unity and let S be a subset of M. Then S is called a basis of M if 1. M is generated by S 2. S is linearly independent set. Also we define free module as An R module M is called a free module if there exists a subset S of M s.t.S...

Homework Statement Let A = [1 0 4 2 ] Let B be the eigenbasis {[1,4], [0,1]}. --Find [T]B where T(x)=A(x). The Attempt at a Solution Would [T]B = {[1,-1], [0,2]}? We are trying to find [T]B, the matrix representation of T with respect to B. So would my answer...

I'd like to understand why i cannot seem to be able to define unit polar basis vectors. Let me explain: We have our usual polar coordinates relation to Cartesian: x = r cosθ ; y = r sinθ if I define \hat{e_{r}}, \hat{e_{\vartheta}} as the polar basis vectors, then they should be...

Please see attached question In my opinion this question is conceptional and abstract.. For part a and b, I think dim(Ker(D)) = 1 and Rank(D) = n but I do not know how to explain them For part c What I can think of is if we differentiate f(x) by n+1 times then we will get 0 Can...

Hi friends! I am getting started with a research paper that discusses the closure properties of a robotic grasp. There are of lot of mathematical terms that confuse me like 'convex hull' , convex basis, convex combination of vectors, a free subset, nullspace etc. I might have studied some of...

Homework Statement This isn't exactly a homework question, but I figured this would be the best subforum for this sort of thing. For the sake of a concrete example, let's just say my question is: Express the position operator's eigenstates in terms of the number operator's eigenstates...

Homework Statement B = {b1, b2, b3} and C = {c1, c2, c3} are two basis's for R3 where the connection between the basis vectors are given by b1 = -c1 + 4c2, b2 = -c1 + c2 + c3, b3 = c2 - 2c3 a) decide the transformation matric from basis B to basis C. A vector x is given in...

I've looked at this topic for a while and I have yet to come to any sort of conclusive answer when it comes to calculating the basis of a surface's tangent vector. Do you have a concrete method or know where I can find one for doing this? Thank you

Hello guys. when i write s_z matrix in s_y basis with unitary transformation i get s_y but in second method when i rotate s_z about x-axis ( - pi/2 ) to get s_z in s_y basis , i get -s_y ! and if we consider cyclic permutation, s_z becomes s_x. i am totally confused! three methods and three...

Hi Guys, I have a question about observable's and superposition's that I haven't been able to find a definitive answer to (purely for the fact that it doesn't seem to be addressed), and would greatly appreciate an answer. When in a superposition state of an observable, you are also in a...

x^2 - y^2 in the \mid n\ell m \rangle basis - tensor op. Homework Statement I must determine the matrix elements of x^2 - y^2 in the \mid n\ell m \rangle basis. "...use the fact that x^2 - y^2 is a sum of spherical components of a rank two tensor, together with the explicit form of the...

Homework Statement Find the parameter derivative of the vector function v(u, v) in, say, polar coordinates, i.e, this: http://en.wikipedia.org/wiki/Vector-valued_function#Derivative_of_a_vector_function_with_nonfixed_bases but deriving with respect to the parameter u or v instead of the...

Homework Statement Determine the column vectors representing |+x> and |-x> using the states |+y> and |-y> as a basis. Homework Equations N/A The Attempt at a Solution I know that if |+y> and |-y> are used as a basis, then they are the column vectors (1,0) and (0,1) respectively. I...

Homework Statement The problem asks, find a basis for the P2 subspace that consists of polynomials, p(x) such that p'(5)=0. The Attempt at a Solution I know that a set of vectors is a basis if it's linear independent and spans the vector space. So I let p(x) = ax2 + bx +c ...

What is the basis of a bivector? For example (see the attachment and http://en.wikipedia.org/wiki/Bivector#Axial_vectors first): e_{11}=\begin{bmatrix} 1 & 0 & 0\\ 0 & 0 & 0\\ 0 & 0 & 0\\ \end{bmatrix} or e_{11}=\begin{bmatrix} 1\\ 0\\ 0\\ \end{bmatrix} or ##e_{11}## is equal to what...

Hello MHB, (I Hope the picture is read able) this is a exemple on My book ( i am supposed to find a singular value decomposition) well My question is in the book when they use gram-Schmidt to extand they use $$(u_1,u_2,e_3)$$ but I would use $$(u_1,u_2,e_1)$$ cause it is orthogonal against u_2...

How to select the good basis for the special Hamiltonian?? For the Hamiltonian H=\frac{P^2}{2\mu} -\frac{Ze^2}{r}+ \frac{\alpha}{r^3} L.S (which we can use L.S=\frac{1}{2} (J^2-L^2-S^2)in the third term) how to realize that the third term,\frac{\alpha}{r^3} L.S, commutes with sum of the...

ive been revising all holidays, unfortunately I've just realized I've been finding eigenvalues using the ensemble when i may have to change basis for the exam. looks at homework questions, workshop questions... nothing! anyway an example problem: rewrite |PSI> = a|0> + b|1> in the...

Hello all, I have these two sets (I couldn't use the notation {} in latex, don't know how). V is the set of matrices spanned by these 3 matrices written below. W is a set of 2x3 matrices applying the rule a+e=c+f \[V=span(\begin{pmatrix} 1 &1 &1 \\ 1 &3 &7 \end{pmatrix},\begin{pmatrix} 0 &0...

Homework Statement A point begins at rest at x = 0 and accelerates at 1.09 m/s^2 to the right for 10 s. It then continues at constant velocity of 10.9 m/s for 8 more seconds. In the third phase of its motion, it decelerates at 5 m/s^2 and is observed to be passing again through the origin when...

Given a basis \mathfrak{B}=\lbrace\mathbf{e}_{i}\rbrace it is possible to represent a vector \mathbf{v} as a column vector \left[\mathbf{v}\right]_{\mathfrak{B}}= \left(\begin{matrix}v^{1} \\ v^{2} \\ \vdots \\ v^{n}\end{matrix}\right) where the v_{i} are the components of \mathbf{v} relative...

Homework Statement Alright, so this is not exactly a guided homework question. It is a rather intricate problem consisting of many steps, but one of these steps comes down to working out the hyperfine interaction between two spin 1 particles, from a hamiltonian point of view. From what I have...

Homework Statement Let v_1,...,v_k be vectors in a vector space V. If v_1,...,v_k span V and after removing any of the vectors the remaining k-1 vectors do not span V then v_1,...,v_k is a basis of V? Homework Equations The Attempt at a Solution If v_1,...,v_k span V but...

Homework Statement For the orthonormal coordinate system (X,Y) the metric is \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix} Calculate G' in 2 ways. 1) G'= M^{T}*G*M 2) g\acute{}_{ij} = \overline{a}\acute{}_{i} . \overline{a}\acute{}_{j} Homework Equations \begin{pmatrix}...

Hey guys so we need to find the basis for 0 1 \sqrt{2} 0 0 0 0 0 0 I know how you do it. But my prof says that one of the basis vectors is (1 0 0) but I don't know how he arrives at this?

Hello all, I don't have a question on homework specifically, but I need clarification on something I'm reading in the textbook. I will be starting an abstract algebra class in the spring and it's been quite a few years since I've had linear algebra, so I'll be reviewing that material before the...

Homework Statement Given ##S = \{1, x, x^2\}##, find the coordinates of ##x^2 + x + 1## with respect to the orthogonal set of S.Homework Equations Inner product on polynomial space: ##<f,g> = \int_{0}^{1} fg \textrm{ } dx## The Attempt at a Solution I used Gram-Schmidt to make ##S## orthogonal...

Hi everyone, :) This seems like a pretty simple question, but up to now I haven't found a method to solve it. Hope you can provide me a hint. :) Problem: Let \(V\) be a space with basis \(B=\{b_1,\,b_2,\,b_3,\,b_4,\,b_5\},\,U\) the subspace spanned by \(u_1=b_1+b_2+b_3+b_4+b_5\)...

Let n be a positive integer, and for each $j = 1,..., n$ define the polynomial $f_j(x)$ by f_j(x) = $\prod_{i=1,i \ne j}^n(x-a_i)$ The factor $x−a_j$ is omitted, so $f_j$ has degree n-1 a) Prove that the set $f_1(x),...,f_n(x)$ is a basis of the vector space of all polynomials of degree ≤ n -...

Homework Statement Find a basis for the subset S = {(1, 2, 1), (2, 1, 3), (1, -4, 3)} Homework Equations The Attempt at a Solution I'm not absolutely sure I'm doing this correctly but here is my attempt: First, I put the vectors in S in the rows of a matrix (using multiple...

The topology ## T ## on a set ## X ## generated by a basis ## B ## is defined as: T=\{U\subset X:\forall\ x\in U\ there\ is\ a\ \beta\in B:x\in \beta \ and\ \beta\subset U \}. But if ##U## is the empty set, and there has to be a ## \beta ## in ##B## that is contained in ##U##, the empty set...

Let β be a basis for ℝ over Q (the set of all rational numbers) and let a\inℝ, a≠1. Show that aβ={ay|y\inβ} is a basis for ℝ over Q for all a≠0. So I need to show (1) Linear independence, and (2) spanning. I am a little confused, especially because the dimension for the vector space is...