Rudin, Mary Ellen A subset of the countable ordinals. (English) Zbl 0109.24401 Am. Math. Mon. 64, 351 (1957). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 4 Documents Keywords:set theory PDFBibTeX XMLCite \textit{M. E. Rudin}, Am. Math. Mon. 64, 351 (1957; Zbl 0109.24401) Full Text: DOI