The meetings on functional equations, which are now called International Symposia on Functional Equations, have been held annually since 1962 (with the exception of 1964). The first conference, with 14 participants from 5 countries, was organized by Professors J. Aczél, O. Haupt and A. Ostrowski in the Mathematical Research Institute of Oberwolfach, Germany. Of the previous 52 symposia, 15 took place in Germany, 5 in each of Austria, Canada, Italy and Poland, 4 in Hungary, 3 in each of the Czech Republic, France and the United States, 2 in Spain, and 1 in each of Denmark and Switzerland.

Nowadays, the series has an international scientific committee which invites leading specialists in the field to attend a symposium. The average number of participants of the last five meetings is about 65, and they came from Austria, Canada, China, the Czech Republic, Denmark, France, Germany, Hungary, Iran, Israel, Italy, Luxembourg, Poland, Russia, Saudi Arabia, Switzerland and the United States. The reports of meetings are published in Aequationes Mathematica.