“With every simple act of thinking, something permanent, substantial, enters our soul. This substantial somewhat appears to us as a unit but (in so far as it is the expression of something extended in space and time) it seems to contain an inner manifoldness; I therefore name it "mind-mass."”

— Bernhard Riemann

All thinking is, accordingly, formation of new mind masses.
Gesammelte Mathematische Werke (1876)

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German mathematician 1826–1866

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