Semnan University International Journal of Nonlinear Analysis and Applications 2008-6822 2025 10 17 Fuzzy stability of a system of Euler-Lagrange quadratic functional equations via classical methods 10155 10.22075/ijnaa.2025.39070.5548 EN Abasalt Bodaghi Department of Mathematics, W.T. C., Islamic Azad University, Tehran, Iran 0000-0003-0358-4518 Somaye Grailoo Esfarayen University of Technology, Esfarayen, North Khorasan, Iran Zahra Ghorbani Department of Mathematics, Jahrom University, Jahrom, Iran Journal Article 2025 08 17 This paper aims to establish stability for a system of Euler-Lagrange quadratic functional equations by applying the so-called direct (Hyers) method and a fixed point technique in the setting of fuzzy normed spaces.  Comparing the results obtained by the mentioned ways, we find that the fixed point tool not only needs a less conditions for the proofs but also gives us a more exact approximation of approximately Euler-Lagrange-type quadratic mappings in comparison to the direct approach. https://ijnaa.semnan.ac.ir/article_10155_17737832ac17be5216f187a82c20936e.pdf