With great sorrow we mark the passing of Prof. İ. Burhan Türkşen , a visionary researcher in fuzzy set theory and a respected member of our scientific community. His innovations opened new directions of research and expanded the theoretical framework of fuzzy systems. Beyond his scholarly achievements, he was admired for his mentorship, generosity, and commitment to scientific collaboration. His legacy will remain an integral part of the field, and he will be remembered with deep respect and gratitude.