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A. Einstein. Autograph letter signed, to the mathematician E.G. Straus, with three equations [spring 1945?] | Important Manuscripts, Continental Books and Music | Books & Manuscripts | Sotheby's
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Albert Einstein Autograph Letter Signed on Unified Field Theory with Equations (including his favorite equation “Rik =0”) for sale at auction on 23rd September | Bidsquare
![Kurt Gödel: Jahrhundertmathematiker und großer Entdecker : Goldstein, Rebecca, Schmidt, Thorsten: Amazon.de: Bücher Kurt Gödel: Jahrhundertmathematiker und großer Entdecker : Goldstein, Rebecca, Schmidt, Thorsten: Amazon.de: Bücher](https://m.media-amazon.com/images/I/613U2RFXu7L._AC_UF894,1000_QL80_.jpg)
Kurt Gödel: Jahrhundertmathematiker und großer Entdecker : Goldstein, Rebecca, Schmidt, Thorsten: Amazon.de: Bücher
![Feeling our way': a densely scientific letter, including an equation, Albert Einstein. 1945 | Christie's Feeling our way': a densely scientific letter, including an equation, Albert Einstein. 1945 | Christie's](https://www.christies.com/img/LotImages/2020/CKS/2020_CKS_18958_0024_000(feeling_our_way_a_densely_scientific_letter_including_an_equation_albe053338).jpg?mode=max)