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In page Ernst Mach:

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The last is singled out, particularly by Einstein, as "the" Mach's principle. Einstein cited it as one of the three principles underlying general relativity. In 1930, he wrote, "it is justified to consider Mach as the precursor of the general theory of relativity" and "the whole direction of thought of this theory conforms with Mach's".[6][7] Einstein further reported that he had read David Hume and Mach's work "with eagerness and admiration shortly before finding relativity theory" and that "very possibly, I wouldn't have come to the solution without those philosophical studies".[8] Before his death, Mach apparently rejected Einstein's theory.[d] Einstein knew his theories did not fulfill all Mach's principles, and no subsequent theory has either.[citation needed]