That the energy levels of a physical system could be discrete, although Boltzmann used this as a mathematical device with no physical meaning
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That the energy levels of a physical system could be discrete, although Boltzmann used this as a mathematical device with no physical meaning
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-17 from Wikipedia. The archived copy is preserved so this citation survives link rot.