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The meaning of relativity

By Albert Einstein

In 1921, five years after the appearance of his comprehensive paper on general relativity and twelve years before he left Europe permanently to join the Institute for Advanced Study, Albert Einstein visited Princeton University, where he delivered the Stafford Little Lectures for that year.

Theory of relativity

These four lectures constituted an overview of his then controversial theory of relativity.
In particular, the author's heuristic derivation of the gravitational field equations from Poisson's equation is briliant.