TY - JOUR ID - 679842 TI - Stability of cosine type functional equations onmodule extension Banach algebras JO - Mathematical Analysis and its Contemporary Applications JA - MACA LA - en SN - AU - Zivari-Kazempour, Abbas AD - Department of Mathematics, Ayatollah Borujerdi University, Borujerd, Iran. Y1 - 2019 PY - 2019 VL - 1 IS - 1 SP - 44 EP - 49 KW - Stability KW - Cosine functional equations KW - multiplicative function DO - 10.30495/maca.2021.679842 N2 - Let A be a Banach algebra and X be a Banach A-bimodule. In this paper we investigate the stability of the cosine type functional equation φ(ab,a·y+x·b)=φ(ab,x·b-a·y)=2φ(a,x)φ(b,y),on module extension Banach algebra U=A+X. UR - https://www.macajournal.com/article_679842.html L1 - https://www.macajournal.com/article_679842_96163650a1151f904bd60658e8ab2f1a.pdf ER -