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In geometric topology, the side-approximation theorem was proved by Bing (1963). It implies that a 2-sphere in R3 can be approximated by polyhedral 2-spheres.
- Bing, R. H. (1957), "Approximating surfaces with polyhedral ones", Annals of Mathematics. Second Series 65: 465–483, ISSN 0003-486X, JSTOR 1970057, MR 0087090
- Bing, R. H. (1963), "Approximating surfaces from the side", Annals of Mathematics. Second Series 77: 145–192, ISSN 0003-486X, JSTOR 1970203, MR 0150744