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Erwin Freundlich
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Erwin Freundlich
Erwin Finlay-Freundlich was a German astronomer, a pupil of Felix Klein. Freundlich was a working associate of Albert Einstein and introduced experiments for which the general theory of relativity could be tested by astronomical observations based on the gravitational redshift.
Biography from Wikipedia, CC BY-SA 4.0. Portrait: via Wikipedia (see source).
