オーギュスタン＝ルイ・コーシー
In the special case when Ulam's problem accepts a solution for Cauchy's functional equation "f"("x" + "y") = "f"("x") + "f"("y"), the equation E is said to satisfy the Cauchy–Rassias stability. The name is referred to Augustin-Louis Cauchy and Themistocles M. Rassias.