Relativity by Albert Einstein pdf free download. He is perhaps at his most awkward (and
even repetitive) when describing the roles of coordinate systems and frames of reference, using the curious and confusing analogy of a mollusc (or “reference mollusc”—his German word being “Bezugs molluske”), indicating that he apparently thought of a coordinate system as a physical thing, swimming around like some soft marine invertebrate which could change its shape with time.
Relativity by Albert Einstein pdf free download
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