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A second edition followed in 1914 and received fifteen reprints. A third edition, only slightly modified from the second, was reprinted six times by 1967. [ 2 ] The original text is now in the public domain under US copyright law (although Macmillan's copyright under UK law is reproduced in the 1998 edition from St. Martin's Press).
The concepts of open access and open source support the idea of open textbooks, digital textbooks that are free (gratis) and easy to distribute, modify and update (libre). Schools, teachers or professors may design their own open textbooks by gathering open access scholarly articles or other open access resources into one text or one curriculum.
In 1965, physicist Richard Feynman wrote in the essay, New Textbooks for the "New" Mathematics: If we would like to, we can and do say, "The answer is a whole number less than 9 and bigger than 6," but we do not have to say, "The answer is a member of the set which is the intersection of the set of those numbers which are larger than 6 and the ...
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