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In this paper, we introduce and solve the following additive-additive ( 𝑠 , 𝑡 ) -functional inequality

‖ 2 𝑔 ( 𝑥 + 𝑦 2 ) − 𝑔 ( 𝑥 ) − 𝑔 ( 𝑦 ) ‖ + ‖ 2 ℎ ( 𝑥 + 𝑦 2 ) + 2 ℎ ( 𝑥 − 𝑦 2 ) − 2 ℎ ( 𝑥 ) ‖

≤ ‖ 𝑠 ( 𝑔 ( 𝑥 + 𝑦 ) − 𝑔 ( 𝑥 ) − 𝑔 ( 𝑦 ) ) ‖ + ‖ 𝑡 ( ℎ ( 𝑥 + 𝑦 ) + ℎ ( 𝑥 − 𝑦 ) − 2 ℎ ( 𝑥 ) ) ‖ ,

where 𝑠 and 𝑡 are fixed nonzero complex numbers with | 𝑠 | + | 𝑡 | < 1 .

We define a pair of hom-derivation and homomorphism in complex Banach algebras, and using the direct method and the fixed point method, we prove the Hyers-Ulam stability of pairs of hom-derivations and homomorphisms in complex Banach algebras, associated to the additive-additive ( 𝑠 , 𝑡 ) -functional inequality ( ??? ) and the following functional inequality

‖ 𝑔 ( 𝑥 𝑦 ) − 𝑔 ( 𝑥 ) ℎ ( 𝑦 ) − ℎ ( 𝑥 ) 𝑔 ( 𝑦 ) ‖ + ‖ ℎ ( 𝑥 𝑦 ) − ℎ ( 𝑥 ) ℎ ( 𝑦 ) ‖ ≤ 𝜑 ( 𝑥 , 𝑦 ) .

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Functional inequalities and pairs of hom-derivations and homomorphisms Se Won Min, Choonkil Park p. 389-399