Let f ∈ L (U, V ), g ∈ L (V, W) and let U, V be finite-dimensional. Prove that(a) dim im(g ◦ f) = dim im f − dim(ker g ∩ im f) and so dim im(g ◦ f) ≤ min(dim im f, dim im g);(b) dim ker(g ◦ f) = dim ker f + dim(ker g ∩ im f) and so dim ker(g ◦ f) ≤ dim ker f + dim ker g.
Let f ∈ L (U, V ), g ∈ L (V, W) and let U, V be finite-dimensional. Prove that(a) dim im(g ◦ f) = dim im f − dim(ker g ∩ im f) and so dim im(g ◦ f) ≤ min(dim im f, dim im g);(b) dim ker(g ◦ f) = dim ker f + dim(ker g ∩ im f) and so dim ker(g ◦ f) ≤ dim ker f + dim ker g.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.2: Mappings
Problem 28E: 28. Let where and are nonempty. Prove that has the property that for every subset of if...
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Let f ∈ L (U, V ), g ∈ L (V, W) and let U, V be finite-dimensional. Prove that
(a) dim im(g ◦ f) = dim im f − dim(ker g ∩ im f) and so dim im(g ◦ f) ≤ min(dim im f, dim im g);
(b) dim ker(g ◦ f) = dim ker f + dim(ker g ∩ im f) and so dim ker(g ◦ f) ≤ dim ker f + dim ker g.
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