Problem 14. Prove that a function f: V→ W is linear if and only if its graph¹ is a subspace of VW.

Advanced Engineering Mathematics
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Chapter2: Second-order Linear Odes
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Fix a field F. The direct sum of two F-vector spaces V and W is the F-vector space
VW defined as follows. As a set, V W is equal to V x W, and addition and scalar
multiplication on VW are defined component-wise: (v₁, W₁) +(v2, W₂) = (v₁+V2₂, W₁+W₂)
and c(v, w) = (cv, cw).
Problem 14. Prove that a function f: V → W is linear if and only if its graph¹ is a subspace
of VW.
Transcribed Image Text:Fix a field F. The direct sum of two F-vector spaces V and W is the F-vector space VW defined as follows. As a set, V W is equal to V x W, and addition and scalar multiplication on VW are defined component-wise: (v₁, W₁) +(v2, W₂) = (v₁+V2₂, W₁+W₂) and c(v, w) = (cv, cw). Problem 14. Prove that a function f: V → W is linear if and only if its graph¹ is a subspace of VW.
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