Gustav Fechner mathematically formulated the law named after his mentor Weber.

Evidence

Ernst Heinrich Weber (pronounced Vay-burr) conducted the experiments needed to formulate the law. However, his student Gustav Fechner formulated the law mathematically and named it after his mentor. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 804

Categorization

• CANDY: An easy name-dropping fact: the famous Weber whose name is on the law did the experiments, but his student Fechner wrote the math and insisted on the mentoring credit.
• corroborated: 2 independent passages support this claim — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 804