How Einstein believed that space is curved?

FrancisClinton
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It took einstein 4 years to complete his general theory of relativity but the fundamental idea behind this work is that he believed that space is curved , how he is sure about this idea from the beginning ?
 
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FrancisClinton said:
It took einstein 4 years to complete his general theory of relativity but the fundamental idea behind this work is that he believed that space is curved , how he is sure about this idea from the beginning ?
What do you mean "sure about this idea from the beginning"? How do you know he was sure about it from the beginning?
 
just asking what made him to believe in this idea " space is curved"
 
He explained this in very clear and nontechnical language in the introduction to his paper on GR:

The foundation of the general theory of relativity
A. Einstein, Annalen der Physik 49 (1916) 769.

You can find English translations online, e.g., in the back of this book: http://www.lightandmatter.com/genrel/
 
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