File:Einstein, Albert – Vier Vorlesungen über Relativitätstheorie, 1923 – BEIC 3937638.jpg
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![File:Einstein, Albert – Vier Vorlesungen über Relativitätstheorie, 1923 – BEIC 3937638.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Einstein%2C_Albert_%E2%80%93_Vier_Vorlesungen_%C3%BCber_Relativit%C3%A4tstheorie%2C_1923_%E2%80%93_BEIC_3937638.jpg/388px-Einstein%2C_Albert_%E2%80%93_Vier_Vorlesungen_%C3%BCber_Relativit%C3%A4tstheorie%2C_1923_%E2%80%93_BEIC_3937638.jpg?20210503125719)
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