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Grey iron metal and yellow sulfur are both chemical elements, and they can be mixed together in any ratio to form a yellow-grey mixture. No chemical process occurs, and the material can be identified as a mixture by the fact that the sulfur and the iron can be separated by a mechanical process, such as using a magnet to attract the iron away from the sulfur. | Project Gutenberg s Introduction to Infinitesimal Analysis by Oswald Veblen and N. J. Lennes This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title Introduction to Infinitesimal Analysis Functions of one real variable Author Oswald Veblen and N. J. Lennes Release Date July 2 2006 EBook 18741 Language English Character set encoding TeX START OF THIS PROJECT GUTENBERG EBOOK INFINITESIMAL ANALYSIS Produced by K.F. Greiner Joshua Hutchinson Laura Wisewell Owen Whitby and the Online Distributed Proofreading Team at http www.pgdp.net This file was produced from images generously made available by Cornell University Digital Collections. 2 Transcriber s Notes. A large number of printer errors have been corrected. These are shaded like this and details can be found in the source code in the syntax correction corrected original . In addition the formatting of a few lemmas corollaries etc. has been made consistent with the others. The unusual inequality sign used a few times in the book in addition to has been preserved although it may reflect the printing rather than the author s intention. The I I notation a b for intervals is not in common use today and the reader able to run IATẹX will find it easy to redefine this macro to give a modern equivalent. Similarly the original did not mark the ends of proofs in any way and so nor does this version but the reader who wishes can easily redefine qedsymbol in the .