Eilenberg, Samuel; MacLane, Saunders Natural isomorphisms in group theory. (English) Zbl 0061.09203 Proc. Natl. Acad. Sci. USA 28, 537-543 (1942). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 7 Documents Keywords:set theory PDF BibTeX XML Cite \textit{S. Eilenberg} and \textit{S. MacLane}, Proc. Natl. Acad. Sci. USA 28, 537--543 (1942; Zbl 0061.09203) Full Text: DOI OpenURL