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Questions › DSE › DSE 2012 › Q50
2 marksMathematics › Vector spaces, rank and eigenvalues › Norms, inner products and orthogonalityHardabout 4 min

DSE 2012 Question 50: Vector spaces, rank and eigenvalues

Let x=(x1,x2,…,xn)x=(x_{1},x_{2},\ldots,x_{n})x=(x1​,x2​,…,xn​) and y=(y1,y2,…,yn)y=(y_{1},y_{2},\ldots,y_{n})y=(y1​,y2​,…,yn​) be two vectors in ℜn\Re^{n}ℜn. Define, x⊗y=∑i=1nxi∣yi∣x\otimes y=\sum_{i=1}^{n}x_{i}|y_{i}|x⊗y=∑i=1n​xi​∣yi​∣, where ∣yi∣|y_{i}|∣yi​∣ stands for absolute value. How many of the following statements are correct: Statement 1: x⊗y=y⊗xx\otimes y=y\otimes xx⊗y=y⊗x. Statement 2: x⊗x=0x\otimes x=0x⊗x=0 implies x=(0,0,…,0)x=(0,0,\ldots,0)x=(0,0,…,0). Statement 3: x⊗(c.y)=c(x⊗y)x\otimes(c.y)=c(x\otimes y)x⊗(c.y)=c(x⊗y), where c∈ℜ++c\in\Re_{++}c∈ℜ++​ and c.y=(cy1,cy2,…,cyn)c.y=(cy_{1},cy_{2},\ldots,cy_{n})c.y=(cy1​,cy2​,…,cyn​)

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Let x=(x₁,x₂,…,xₙ) and y=(y₁,y₂,…,yₙ) be two vectors in ℜⁿ. Define, x⊗ y=Σᵢ₌₁ⁿxᵢ|yᵢ|, where |yᵢ| stands for absolute value. How many of the following statements are correct: Statement 1: x⊗ y=y⊗ x. Statement 2: x⊗ x=0 implies x=(0,0,…,0). Statement 3: x⊗(c.y)=c(x⊗ y), where c∈ℜ₊₊ and c.y=(cy₁,cy₂,…,cyₙ) (A) 0 (B) 1 (C) 2 (D) 3

Also written as: Let x=(x_1,x_2,...,x_n) and y=(y_1,y_2,...,y_n) be two vectors in Re^n. Define, x(x) y= sum_(i=1)^nx_i|y_i|, where |y_i| stands for absolute value. How many of the following statements are correct: Statement 1: x(x) y=y(x) x. Statement 2: x(x) x=0 implies x=(0,0,...,0). Statement 3: x(x)(c.y)=c(x(x) y), where c in Re_(++) and c.y=(cy_1,cy_2,...,cy_n)

Vector spaces, rank and eigenvalues has come up 41 times in 6 exams since 2008.

What this question tests

This question is on Norms, inner products and orthogonality, part of Vector spaces, rank and eigenvalues in Mathematics.

Length and angle in vector spaces and the matrices that preserve them.

TestStop has 7 past-paper questions on this subtopic; the nearest in year are below.

  • IIT JAM 2021 · Q10Let ‖·‖ and ⟨·,·⟩ denote the standard norm and inner product in ℝⁿ. If u, v ∈ ℝ³ with ‖u‖ = ‖v‖ = 2 and the…
Practise Vector spaces, rank and eigenvaluesMore on Norms, inner products and orthogonality

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Question from the DSE 2012 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.