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Let A be a complex commutative Banach algebra with unit 1 and δ > 0. A linear map ϕ: A → ℂ is said to be δ-almost multiplicative if
|ϕ(ab) - ϕ(a)ϕ(b)| ≤ δ||a|| ||b|| for all a,b ∈ A.
Let 0 < ϵ < 1. The ϵ-condition spectrum of an element a in A is defined by
with the convention that when λ - a is not invertible. We prove the following results connecting these two notions:
(1) If ϕ(1) = 1 and ϕ is δ-almost multiplicative, then for all a in A.
(2) If ϕ is linear and for all a in A,...
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