Help Wanted: Planck and Kant

Does anyone know whether Planck got his term quantum from Kant? It seems very likely to me, given his rationalization: quantum is “a purely formal assumption ... actually I did not think much about it...” rather than something physically there in reality. Kant, the father of correlationism, the father of correlationist quantum theory? Inquiring minds need to know.

This is because Kant makes a precise distinction between quantitas and quantum. Quantitas is the division of a quantum into measureable parts. A quantum has no parts and is the basis for measurement.

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