Prove that δ: M2×2(F)→F is a 2-linear function if and only if it has the form δ(A) = A11A22a+ A11A21b + A12A22c + A12A21d for some scalars a, b, c, d ∈F.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter3: Matrices
Section3.6: Introduction To Linear Transformations
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Prove that δ: M2×2(F)→F is a 2-linear function if and only if it has the form δ(A) = A11A22a+ A11A21b + A12A22c + A12A21d for some scalars a, b, c, d ∈F.

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