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Letter from Albert Einstein to Constantin Carathéodory (Κωνσταντίνος Καράθεοδωρη)

The collaboration between Einstein and K. Karatheodory for solving the relativity space and time problem and the friendly relationship between them is expressed on the following letter.    

Berlin, Sunday
Dear colleague!
I find your derivation wonderful, now I understand everything. At first, the small writing mistakes on the second page had caused me some difficulties. Now, however, I understand everything. You should publish the theory in this new form in the Annals of Physics since the physicists do not normally know anything about this subject as was also the case with me. With my letter I must have come across to you like a Berliner who had just discovered Grunewald and wondered whether people were already living there.
If you wouldn't mind also making the effort to present to me the canonical transformations, you'll find in me a grateful and attentive audience. If you, however, answer the question about the closed time trajectories, I will appear before you with my hands folded. The underlying truth, though, is well worth some perspiration.
Best regards, your Albert Einstein.

ΓΡΑΜΜΑτου  Άλμπερτ Αϊνστάιν προς Κωνσταντίνο Καράθεοδωρη

Η συνεργασία του Αϊνστάιν με τον Καραθεοδωρή για την επίλυση του προβλήματος περί της σχετικότητας αλά και την φιλική σχέση και εκτίμηση μεταξύ τους εκφράζετε στην  ακόλουθο επιστολή.  

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