Theoretical physics.[ref]
https://archives.collections.ed.ac.uk/repositories/2/archival_objects/237297. Independent professional profile
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Louis de Broglie was a French physicist who is best known for his groundbreaking contributions to quantum theory. Born on August 15, 1892, he introduced the concept of wave-particle duality, which suggests that particles such as electrons exhibit both wave-like and particle-like properties.
