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To achieve this, I utilize previous results concerning the difference property of higher orders of the class of n-times continuously differentiable functions.<\/jats:p>","DOI":"10.3390\/sym17020152","type":"journal-article","created":{"date-parts":[[2025,1,21]],"date-time":"2025-01-21T08:46:26Z","timestamp":1737449186000},"page":"152","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Stability of Fr\u00e9chet Functional Equation in Class of Differentiable Functions"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8497-8262","authenticated-orcid":false,"given":"Marcin","family":"Adam","sequence":"first","affiliation":[{"name":"Department of Mathematics, Silesian University of Technology, Kaszubska 23, 44-100 Gliwice, Poland"}]}],"member":"1968","published-online":{"date-parts":[[2025,1,21]]},"reference":[{"key":"ref_1","unstructured":"Ulam, S.M. (1960). 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