Bela Fejer Obituary May 2026
Born in Budapest in 1955, Bela Fejer grew up under the long shadow of his grandfather, Lipót Fejér—one of the founding fathers of modern harmonic analysis. For any young mathematician, such a lineage is both a blessing and a curse. In his early twenties, Bela struggled to emerge from the academic orbit of his forebear. He often joked, “At family dinners, they didn’t ask if I liked math. They asked if I had found a new proof for Fejér’s theorem yet. I was ten.”
After escaping a trajectory of comparative obscurity (he spent his early post-doc years at the University of Warwick and later at the University of Chicago), Bela Fejer did the unthinkable: He returned to the very problem that haunted his childhood. In 2005, he published his seminal work, “On the Divergence of Fourier Series at Lebesgue Points,” which finally resolved the 1918 conjecture. It was a masterpiece of counterexample—proving that even at so-called “nice” points, a Fourier series could misbehave in ways his grandfather never imagined. bela fejer obituary
Diagnosed with idiopathic pulmonary fibrosis in 2019, Bela Fejer continued to work from his home in Budapest, collaborating with young researchers via an aging laptop that he famously refused to upgrade. “New computers make you lazy,” he told the Notices of the AMS in a 2022 interview. “I want my proofs to survive a power outage.” Born in Budapest in 1955, Bela Fejer grew
In his final months, he completed a 47-page manuscript titled “Approximation in the Dark: On the Limits of Numerical Analysis.” It has been submitted to the Annals of Mathematics and is currently under review. The opening line reads: “Precision is not truth. It is merely truth’s well-dressed cousin.” He often joked, “At family dinners, they didn’t
When the end came, his son Andras reports that Bela’s last words were a mumble about a counterexample to the Carleson conjecture in lower dimensions. “He was trying to write it on the bedsheet with a finger,” Andras said. “The nurse thought he was ordering soup.”
Beyond the Szegő Prize, Bela Fejer was a Fellow of the American Mathematical Society (2015), a recipient of the Humboldt Research Award (2011), and an elected member of the Hungarian Academy of Sciences (2019). He served on the editorial boards of the Journal of Approximation Theory and the Acta Mathematica Hungarica.
Yet colleagues note that he refused a prestigious chair at the Institute for Advanced Study in Princeton. When asked why, he replied, “Too many people thinking deeply about the same ten problems. I prefer the beautiful chaos of a state university. You get better questions from exhausted undergrads than from rested geniuses.”