4. Let W be a subspace of a vector space V. We define a relation:V₁ ~ V₂ if V₁ V₂ € W.V14a. Show that this relation '~' is an equivalence relation on V. Namely,show: (i) Reflexive: v~ v; (ii) Symmetric: v₁ ~ V2 ⇒ V2 ~ V₁; and(iii) Transitive: V₁ V2, V₂ V3 ⇒ V₁ ~ V3.4b. Denote by V := = {x EV|x~v} the equivalence class contain-ing v (surely, v Ev), and we call v a representative of the class v.Show that v = v+W := {v + w|w€ W}.4c. For v₂ EV, show: either V₁ V₂ = Ø or V₁ = V₂. Show: there areequivalence classes Va (a E A) such that V is a disjoint union of them(for some index set A): V = LlaEA Vaj show: V₁ = V₂ ⇒ V₁ ~ V₂.(Remark. 4c hold for any equivalence relation on a set.)4d. Show that the cardinality Va| = |VB| for any a, ß € A.Hint. Use 4b and show the bijectivity of the map:f: Va → VB (Va+W+Vg+w).

Answered: Image /qna-images/answer/c16c98ac-b3f6-4c26-90d4-5fa1fb87a5c7.jpg

4. Let W be a subspace of a vector space V. We define a relation: V₁ V₂ if V₁ V₂ € W. ~ 4a. Show that this relation '~' is an equivalence relation on V. Namely, show: (i) Reflexive: v~ v; (ii) Symmetric: v₁ ~ V2 ⇒ V2 ~ V₁; and (iii) Transitive: V₁1~ V2, V2 V3 ⇒ V₁ ~ V3. 4b. Denote by v := {x € V | x ~ v} the equivalence class contain- ing v (surely, v Ev), and we call v a representative of the class v. Show that v = v+W:= {v + w|w€ W}. = or 4c. For v₂ € V, show: either v₁V₂00 V₁ = V₂. Show: there are equivalence classes Va (a € A) such that V is a disjoint union of them (for some index set A): V = LlaEA Vai show: V₁ = V₂ ⇒ V₁ ~ V2.

4. Let W be a subspace of a vector space V. We define a relation: V₁ V₂ if V₁ V₂ € W. ~ 4a. Show that this relation '~' is an equivalence relation on V. Namely, show: (i) Reflexive: v~ v; (ii) Symmetric: v₁ ~ V2 ⇒ V2 ~ V₁; and (iii) Transitive: V₁1~ V2, V2 V3 ⇒ V₁ ~ V3. 4b. Denote by v := {x € V | x ~ v} the equivalence class contain- ing v (surely, v Ev), and we call v a representative of the class v. Show that v = v+W:= {v + w|w€ W}. = or 4c. For v₂ € V, show: either v₁V₂00 V₁ = V₂. Show: there are equivalence classes Va (a € A) such that V is a disjoint union of them (for some index set A): V = LlaEA Vai show: V₁ = V₂ ⇒ V₁ ~ V2.

Linear Algebra: A Modern Introduction

4th Edition

ISBN:9781285463247

Author:David Poole

Publisher:David Poole

Chapter6: Vector Spaces

Section6.5: The Kernel And Range Of A Linear Transformation

Problem 38EQ

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