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Why is it not true that 0.999 ... 1 ?
The Teaching of Mathematics, XI (2008) no. 1, p. 35 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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The contribution describes three basic obstacles preventing students from understanding the concept of infinite series in teaching of mathematics and provides means to their removal.
Classification : 00A35 D70
Keywords: Infinite series, obstacle, limit of a sequence, potential and actual perception of the infinite limit process, the relation of phylogenesis and ontogenesis. 
@article{TM2_2008_XI_1_a3,
     author = {Petr Eisenmann},
     title = {Why is it not true that 0.999 ... < 1 ?},
     journal = {The Teaching of Mathematics},
     pages = {35 },
     year = {2008},
     volume = {XI},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2008_XI_1_a3/}
}
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Petr Eisenmann. Why is it not true that 0.999 ... < 1 ?. The Teaching of Mathematics, XI (2008) no. 1, p. 35 . http://geodesic.mathdoc.fr/item/TM2_2008_XI_1_a3/